The network administrator is adding a new N1Kv to the vCenter， however， the administrator does not see the new switch under the networking tab of vCenter. The administrator issues the following command on the VSM to troubleshoot： VSM# show svs connections connection VC： ip address： 10.10.10.30 remote port： 80 protocol： vmware-vim https certificatE. default datacenter namE. DC1 DVS uuiD. 67 32 30 50 a6 d2 49 64-9e 1c 5f 49 e3 af 55 99 config status： Disabled operational status： Disconnected sync status： - version： - When attempting to fix the issue， the following error is seen： VSM-PRI-188# conf VSM-PRI-188（config）# svs connection VC VSM-PRI-188（config-svs-conn）# connect ERROR： [VMWARE-VIM] Extension key was not registered before its use What is the cause of the error？（）
- A Missing control VLAN in VSM configuration
- B Missing packet VLAN in VSM configuration
- C VSM has no network connection to vCenter
- D VSM extension key is not installed on vCenter
- E vCenter extension key is not installed on VSM