Which method is supported for backing up the virtual machine that contains vCenter Server?

A.
differential

B.
incremental

C.
full image

D.
individual disks

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