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An equilateral triangle ABC formed from ...

An equilateral triangle `ABC` formed from a uniform wire has two small identical beads initially located at `A`. The triangle is set rotating about the vertical axis `AO`. Then the beads are released from rest simultaneously and allowed to slide down, one along `AB` and the other along `AC` as shown. Neglecting frictional effects, the quantities that are conserved as the beads slide down are

A

Angular velocity and total energy

B

total angular momentum and total energy

C

Angular velocity and M.I. about the axis of rotation

D

Total angular momentum and M.I. about the axis of rotation

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