A straight \( \operatorname{rod} A B \) of mass \( M \) and length \( L \) is placed on a fricti...

A straight \( \operatorname{rod} A B \) of mass \( M \) and length \( L \) is placed on a frictionless horizontal surface. A force having constant magnitude \( F \) and a fixed direction starts acting at the end \( A \). The rod is initially perpendicular to the force. The initial acceleration of end \( B \) is
\( \mathrm{P} \)
(a) zero
(b) \( 2 F / M \)
W.
(c) \( 4 F / M \)
(d) None of these