The bracket shown is designed to slide on the pipe but be held in place through friction when a force $P$ is applied. Which constraints does the pipe exert on the bracket when the force $P$ is NOT applied? You may assume that the bracket is weightless. (select all constraints that apply)

A. Moment about y

B. Force in x

C. Moment about x

D. Force in z

E. Moment about z

F. Force in y