Which command on a port enters the forwarding state immediately when a PC is connected to it?

Which command on a port enters the forwarding state immediately when a PC is connected to it?

A. switch(config)#spanning-tree portfast default B. switch(config)#spanning-tree portfast bpduguard default C. switch(config-if)#spanning-tree portfast trunk D. switch(config-if)#no spanning-tree portfast