An equilateral triangle $ABC$ is made of a uniform wire. Two identical beads are initially at $A$. The triangle is set to rotate about a vertical axis $AO$. The beads are then released simultaneously from rest to slide down along $AB$ and $AC$. Neglecting friction,which quantities are conserved as the beads slide down?

• A
  Angular velocity and total energy (kinetic and potential energy)
• B
  Total angular momentum and total energy
• C
  Angular velocity and moment of inertia about the axis of rotation
• D
  Total angular momentum and moment of inertia about the axis of rotation