如下图所示，在一台Cisco Catalyst 3500交换机上连接2台PC，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 dataSwitch-3548 (vlan) # vlan 21 name vl21Switch-3548 (vlan) # vlan 22 name vl22Switch-3548 (vlan) # exitSwitch-3548 # configure terminalSwitch-3548 (config) # interface f0/1Switch-3548 (config-if) # switchport allowed vlan 21Switch-3548 (config-if) # exitSwitch-3548 (config) # inerface f0/2Switch-3548 (config-if) # switchport allowed vlan 22
B．Switch-3548 # vlan dataSwitch-3548 (vlan) # set vlan 21 name vl21Switch-3548 (vlan) # set vlan 22 name vl22Switch-3548 (vlan) # exitSwitch-3548 # configure terminalSwitch-3548 (config) # interface f0/1Switch-3548 (config-if) # switchport access vlan 21Switch-3548 (config-if) # exitSwitch-3548 (config) # inerface f0/2Switch-3548 (config-if) # switchport access vlan 22
C．Switch-3548 # vlan dataSwitch-3548 (vlan) # vlan 21 name vl21Switch-3548 (vlan) # vlan 22 name vl22Switch-3548 (vlan) # exitSwitch-3548 # configure terminalSwitch-3548 (config) # interface f0/1Switch-3548 (config-if) # switchport access vlan 21Switch-3548 (config-if) # exitSwitch-3548 (config) # inerface f0/2Switch-3548 (config-if) # switchport access vlan 22
D．Switch-3548 # vlan dataSwitch-3548 (vlan) # vlan 21 name v121Switch-3548 (vlan) # vlan 22 name v122Switch-3548 (vlan) # exitSwitch-3548 # configure terminalSwitch-3548 (config) # interface f0/1Switch-3548 (config-if) # switchport access 21Switch-3548 (config-if) # exitSwitch-3548 (config) # inerface f0/2Switch-3548 (config-if) # switchport access 22