Which command will show you if a port has been configured for PortFast mode?

A. Switch# show portfast
B. Switch# show interface fa 0/1
C. Switch# show spanning-tree
D. Switch# show spanning-tree interface fa 0/1

D. Using the command show spanning-tree interface fa 0/1 will show the spanning tree configuration for an interface. If PortFast has been configured, the last line will read, “The port is in the PortFast mode.”