According to William Perry's study of the cognitive development of college students, the commitment stage involves which of the following? (Choose all that apply)

A) When students commit to a personal mission statement and a plan to get there.
B) When students realize that not all opinions are equally good.
C) When students finally have a position that they sincerely hold onto.
D) When students no longer trust any authority.
E) When students support a position with reasons and evidence yet remain flexible.