What is one benefit of PVST+?

What is one benefit of PVST+?

A.
PVST+ supports Layer 3 load balancing without loops.

B.
PVST+ reduces the CPU cycles for all the switches in the network.

C.
PVST+ allows the root switch location to be optimized per VLAN.

D.
PVST+ automatically selects the root bridge location, to provide optimized bandwidth usage.