which Client Interface?

vCenter Server Appliance Instance can be backed up using which Client Interface?

A.
vSphere Client Interface

B.
vSphere Web Client Interface

C.
VMware Host Client Interface

D.
Virtual Appliance Management Interface

Explanation:
https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.install.doc%
2FGUID-539B47B4-114B-49BC-9736-F14058127ECA.html