A mass M hangs on a massless rod of length $l$ which rotates at a constant angular frequency. The mass M moves with steady speed in a circular path of constant radius. Assume that the system is in steady circular motion with constant angular velocity $\omega$. The angular momentum of M about point $A$ is La which lies in the positive $z$ direction and the angular momentum of $M$ about $B$ is $L B$. The correct statement for this system is:
Select the correct option:
A
$\mathrm{L}_{\mathrm{A}}$ and $\mathrm{L}_{\mathrm{B}}$ are both constant in magnitude and direction
B
LB is constant in direction with varying magnitude
C
$\mathrm{L}_{\mathrm{B}}$ is constant, both in magnitude and direction
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