In 1995, the Cowboys finished with a  regular season record, the best in the NFC. Pro Bowl quarterback Troy Aikman finished the regular season completing 280 out of 432 passes for 3,304 yards and 16 touchdowns, with only seven interceptions. Pro Bowl running back Emmitt Smith won his fourth and last league rushing crown in his career with 1,773 yards, and broke a league single-season record with 25 rushing touchdowns. Smith was also a reliable receiver out of the backfield, recording a career-high 62 receptions for 375 yards.  Fullback Daryl Johnston added 111 rushing yards, while also catching 30 passes for 248 and scoring three touchdowns. Pro Bowl wide receiver Michael Irvin led the team in receiving with 111 catches for 1,603 yards and 10 touchdowns.  Kevin Williams (wide receiver) was another a big receiving threat with 38 receptions for 613 yards, while also racking up 1,274 return yards on special teams. Pro Bowl tight end Jay Novacek had 62 receptions for 705 yards and five touchdowns. Dallas offensive line was led by Pro Bowl selections Larry Allen, Ray Donaldson, Nate Newton, and Mark Tuinei. However, Donaldson suffered a season-ending injury late in the season and would be replaced by Derek Kennard.
Question: How many offensive linemen were Pro Bowl selections?
Answer: 4