如下图所示，在一台Cisco Catalyst 3500交换机上连接2台PC机，使用端口划分方法将它们分别划分在VLAN ID为21、22，VLAN名为VL21、VL22的VLAN中，下列关于交换机VLAN的配置，正确的是______。

A． Switch-3548 #vlan data
Switch-3548 (vlan)#vlan 21 name v121
Switch-3548 (vlan)#vlan 22 name v122
Switch-3548 (vlan)#exit
Switch-3548 #configure terminal
Switch-3548 (config)#int fo/1
Switch-3548 (config-if)#switehport access vlan 21
Switch-3548 (config)#int fo/2
Switch-3548 (config-if) #switehport access vlan 22
B． Switch-3548 #vlan data
Switch-3548 (vlan)#set vlan 21 name v121
Switch-3548 (vlan)#set vlan 22 name v122
Switch-3548 (vlan)#exit
Switch-3548 #eonfigure terminal
Switch-3548 (config)#int fo/1
Switch-3548 (config-if)#switehport access vlan 21
Switch-3548 (config)#int fo/2
Switch-3548 (config-if)#switehport access vlan 22
C． Switch-3548 #vlan data
Switch-3548 (vlan)#vlan 21 name v121
Switch-3548 (vlan)#vlan 22 name v122
Switch-3548 (vlan)#exit
Switch-3548 #configure terminal
Switch-3548 (config)#int fo/1
Switch-3548 (config-if)#switehport allowed vlan 21
Switch-3548 (config)#int fo/2
Switch-3548 (config-if)#switehport allowed vlan 22
D． Switch-3548 #vlan data
Switch-3548 (vlan)#vlan 21 name v121
Switch-3548 (vlan)#vlan 22 name v122
Switch-3548 (vlan)#exit
Switch-3548 #configure terminal
Switch-3548(config)#int fo/1
Switch-3548(config-if)#switchport access 21
Switch-3548(config)#int to/2
Switch-3548(config-if)#switchport access 22