Strictly Follow Depth Chart: The coach will (usually) play according to your depth chart (starters should get ~30-42 min, backups ~10-14, reserves ~0-6). These numbers will be affected by: Injuries, Foul outs, Blowouts, and Stamina.
Depth Chart Until 4th: The coach will play according to your depth chart, until the 4th quarter. In the 4th, the coach will decide who to play where.
Let Coach Decide: The coach will decide who to play from your selected roster.
Coach Picks From Depth Chart: The coach will decide who to play from your depth chart. (I think he play the players in their proper positions according to the depth chart, but he decides for himself how many minutes each player plays.)