Which protocol is a Cisco proprietary enhancement for 802.1w that allows separate spanning-tree instances for each VLAN?

A. Rapid PVST+
B. PVST+
C. CST
D. RSTP+

A. Rapid Per-VLAN Spanning Tree+ elects a root bridge for each VLAN. It allows for fast convergence times and logical placement of the root bridge. However, it requires the most CPU and RAM of all implementations.