You are trunking Switch A and Switch B together. On Switch A you have the default of switchport mode dynamic auto. On Switch B, which command will you need to configure to allow trunking?

A. SwitchB(config-if)# switchport mode trunk
B. SwitchB(config-if)# switchport mode dynamic trunk
C. SwitchB(config-if)# switchport mode dynamic auto
D. SwitchB(config-if)# switchport nonegotiate

A. Switch B will need to either have its interface set to switchport mode trunk or switchport mode dynamic desirable for Switch A to turn its interface into a trunk.