Refer to the exhibit. The trunk does not work over the back-to-back link between Switch1 interface Gig1/0/20 and Switch2 interface Gig1/0/20 Which configuration...

Refer to the exhibit. The trunk does not work over the back-to-back link between Switch1 interface Gig1/0/20 and Switch2 interface Gig1/0/20
Which configuration fixes the problem?

A. Switch 1(config)#interface gig1/0/20 Switch1(config-if)#switchport mode dynamic auto B. Switch2(config)#interface gig1/0/20 Switch2(config-if)#switchport mode dynamic desirable C. Switch2(config)#interface gig1/0/20 Switch2(config-if)#switchport mode dynamic auto D. Switch1(config)#interface gig1/0/20 Switch1(config-if)#switchport trunk native vlan 1 Switch2(config)#interface gig1/0/20 Switch2(config-if)#switchport trunk native vlan 1