如果需要在交换机中创建两个编号分别为21和22，VLAN名分别为V21和V22的VLAN，并将端口F0/1和F0/2分别作为接入端口分配给V21和V22，以下哪一组命令序列是正确的。A.Switch#vlan data Switch(vlan)#vlan 21 name v21 Switch(vlan)#vlan 22 name v22 Switch(vlan)#exit Switch#configure terminal Switch(config)#interface FastEthernet0/1 Switch(config-if)#switchport allowed vlan 21 Switch(config-if)#exit Switch(config)#interface FastEthernet0/2 Switch(config-if)#switchport allowed vlan 22 Switch(config-if)#exitB.Switch#vlan data Switch(vlan)#set vlan 21 name v21 Switch(vlan)#set vlan 22 name v22 Switch(vlan)#exit Switch#configure terminal Switch(config)#interface FastEthernet0/1 Switch(config-if)#switchport access vlan 21 Switch(config-if)#exit Switch(config)#interface FastEthernet0/2 Switch(config-if)#switchport access vlan 22 Switch(config-if)#exitC.Switch#vlan data Switch(vlan)#vlan 21 name v21 Switch(vlan)#vlan 22 name v22 Switch(vlan)#exit Switch#configure terminal Switch(config)#interface FastEthernet0/1 Switch(config-if)#switchport access vlan 21 Switch(config-if)#exit Switch(config)#interface FastEthernet0/2 Switch(config-if)#switchport access vlan 22 Switch(config-if)#exitD.Switch#vlan data Switch(vlan)#vlan 21 name v21 Switch(vlan)#vlan 22 name v22 Switch(vlan)#exit Switch#configure terminal Switch(config)#interface FastEthernet0/1 Switch(config-if)#switchport access 21 Switch(config-if)#exit Switch(config)#interface FastEthernet0/2 Switch(config-if)#switchport access 22 Switch(config-if)#exit