You have a network configured in the following exhibit. What needs to be changed?

A. SwitchA(config)#no spanning-tree mode rapid-pvst
B. SwitchB(config)#spanning-tree mode rapid-pvst
SwitchC(config)#spanning-tree mode rapid-pvst
C. SwitchA(config)#spanning-tree priority 16384
D. Nothing to be further configured

D. Nothing needs to be changed in this network because RSTP is backward compatible with STP. On some versions of IOS/models or switches, RSTP is not supported and therefore cannot be configured.