A rod of mass `m` and length `l` suspended from a point swings in a vertica plane such that magnitude of acceleration of its `C.M.` at extreme points is same as that at the mean point then :

Options

A. The deflectin angle from the vertical to the extreme position is `cos^(-1)(3//5)`
B. At the extreme position there is no centripetal acceleration of the `CM`.
C. At the mean position there is no tangential acceleration of the `CM`.
D. The angular momentum of the rod about the suspension point remains constant