You are a senior network administrator at TestKing and your trusty junior administrator tells you that he failed his task of adding VLAN 50 to a Catalyst switch in the network. You enter in the 'show vtp status' command and get this output: TK2# show vtp status VTP Version :2 Configuration Revision :7 Maximum VLANs supported local :68 Number of existing VLANs :8 VTP Operating Mode :Client VTP Domain Name :corp VTP Pruning Mode :Disabled VTP V2 Mode :Disabled VTP Traps Generation :Disabled MD5 digest :0x22 0xF3 0x1A Configuration last modified by 172.18.22.15 at 5-28-03 1t:53:20 What commands must be issued on this switch to add VLAN 50 to the database?（）

• A、TK2(config-if)# switchport access vlan 50
• B、TK2(vlan)# vtp server
• C、TK2(config)# config-revision 20
• D、TK2(config)# vlan 50 name Tech
• E、TK2(vlan)# vlan 50
• F、TK2(vlan)# switchport trunk vlan 50