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.

Explanation:
The PVST+ provides Layer 2 load-balancing for the VLAN on which it runs. You can create
different logical topologies by using the VLANs on your network to ensure that all of your links are
used but that no one link is oversubscribed. Each instance of PVST+ on a VLAN has a single root
switch. This root switch propagates the spanning-tree information associated with that VLAN to all
other switches in the network. Because each switch has the same information about the network,
this process ensures that the network topology is maintained and optimized per VLAN.
Reference:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/12.2_55_se
/configuration/guide/swstp.html