Which three commands must you enter to create a trunk that allows VLAN 20? (Choose three)
A. Switch(config-if)#switchport mode dynamic auto
B. Switch(config-if)#switchport mode trunk
C. Switch(config-if)#switchport trunk allowed vlan 20
D. Switch(config-if)#switchport mode dynamic desirable
E. Switch(config-if)#switchport trunk encapsulation dotlq
F. Switch(config-if)#switchport trunk native vlan 20
