CLEVELAND, Ohio -- Each week, it seems, Dak Prescott answers a different question about his ability to succeed long-term as the Dallas Cowboys' quarterback.

It’s understandable, considering the vast majority of the league’s starting quarterbacks were drafted in the first three rounds, with most selected in the first round. Prescott, a fourth-round draft choice, was the 135th player selected.

On Sunday, Prescott answered the question of whether he could lead the Cowboys to a victory against a winless opponent the week before a game against a “big-name” opponent like the Pittsburgh Steelers.

Dallas 35, Cleveland 10.

It was the Cowboys’ largest margin of victory this season and pushed their winning streak to seven games, tied for the longest in franchise history, and the longest since Jason Garrett became head coach midway through the 2010 season.

Rookie quarterback Dak Prescott has performed with the poise and leadership of an NFL veteran this season. Scott R. Galvin/USA TODAY Sports

In the opener, a loss to the New York Giants, Prescott answered the question of whether he could handle starting in the NFL. Against Washington, he answered whether he could lead the Cowboys to a game-winning drive in the fourth quarter.

Against Chicago, he answered whether he could win at AT&T Stadium, where the Cowboys had lost eight consecutive home games. Against San Francisco, he answered whether he could play through adversity, rallying the Cowboys from a 14-0 deficit.

Against Cincinnati, Prescott answered whether he could beat a good team; and the following week against Green Bay, he answered whether he could win at one of the NFL’s hallowed stadiums: Green Bay’s Lambeau Field.

When the Cowboys beat Philadelphia last week, Prescott answered whether he could play poorly for three quarters and still deliver a win.

Prescott has done everything you could ask of a starter.

He has won, the most important task on his to-do list. The Cowboys have the NFC’s best record -- tied with the New England Patriots for the best in the league -- and their point differential of +83 trails only the Patriots, who are +85.

Dallas has won four games by at least 14 points and five by at least a touchdown. There’s nothing fluky about Prescott, or the team’s performance.

He has passed for more than 200 yards in each game, with 12 touchdowns and two interceptions.

Unlike last week, when sloppy footwork and the Eagles’ pass rush caused him to be inaccurate, Prescott stood confidently in the pocket Sunday surveying the field and going through his progressions until finding a worthy target. He didn’t force a pass into coverage until his final attempt.

He finished 21-of-27 for 247 yards and three touchdowns with a passer rating of 141.8, his best of the season. He ran four times and picked up first downs on two different scoring drives.

“It was more concentrating on my footwork, driving off my back foot, and I think I did a good job with it throughout the game,” Prescott said. “I felt myself a couple of times on my back foot, so I gotta go back and check the film to see if I made progress and did better.”

In the process of helping make the Cowboys a title contender, Prescott has become a leader. It’s not because he has a “C” on his jersey -- he doesn’t -- or because the quarterback is supposed to be the leader.

“I just try to come in and do the right things on and off the field, and show guys how much I care about this game,” he said. “If it results in being a leader, then, yeah, I’m a leader.”

Prescott showed those skills in the second quarter, when Dez Bryant was irate after cornerback Joe Haden was not called for pass interference on an incompletion in the end zone.

“No. 4 is outstanding. The poise, just the way he handles himself, the way he carries himself. The way he keeps people lifted,” Bryant said. “I wanted to say some things because they didn’t call a holding penalty, but Dak was like, 'Let’s just get it right. We good.' You need people like that.

“I was like, 'Boom' it’s erased. Let’s move on to the next play.”

Prescott didn’t think it was a big deal.

“Dez is a guy we need. We don’t need him getting emotional,” Prescott said. “They’re going to hold him and we know that. Flags might come or they might not come, but we can’t let that affect our game.”

The only question left is when will coach Jason Garrett and owner Jerry Jones name him the starter for the rest of the season.