Which command enables RSTP on a switch?

A.
spanning-tree uplinkfast

B.
spanning-tree mode rapid-pvst

C.
spanning-tree backbonefast

D.
spanning-tree mode mst

Explanation:
Rapid Spanning Tree Protocol (RSTP) is an enhancement of the original STP 802.1D
protocol. The RSTP 802.1w protocol is an IEEE open implementation. Cisco has its own
proprietary implementation of RSTP, that includes the benefits of its Per-VLAN spanning tree
protocols, called Rapid-PVST+.
To activate the Rapid-PVST+ protocol:
switch(config)#spanning-tree mode rapid-pvst