When upgrading vCenter Server, an administrator notices that the upgrade fails at the vCenter Single Sign- On installation.
What must be done to allow the upgrade to complete?
A. Verify that the VMware Directory service can stop by manually restarting it.
B. Verify that the vCenter Single Sign-On service can stop by manually restarting it.
C. Uninstall vCenter Single Sign-On service.
D. Uninstall the VMware Directory service.