What is one benefit of PVST+?

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

Answer: C

Explanation:Per VLAN Spanning Tree (PVST) Introduction

http://www.cisco.com/en/US/tech/tk389/tk621/tk846/tsd_technology_support_subprotocol_home.html Per VLAN Spanning Tree (PVST) maintains a spanning tree instance for each VLAN configured in the network. This means a switch can be the root bridge of a VLAN while another switch can be the root bridge of other VLANs in a common topology. For example, Switch 1 can be the root bridge for Voice data while Switch 2 can be the root bridge for Video data. If designed correctly, it can optimize the network traffic. http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=4

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