An administrator is unable to upgrade a vCenter Server Appliance from version 5.1 Update 2 to version 6.0.
What is a likely reason for this?
A.
vCenter Server Appliance 6.0 does not support upgrades from version 5.1 Update 2.
B.
vCenter Server Appliance must be joined to an Active Directory domain before upgrading to version 6.0.
C.
vCenter Server Appliance 5.1 Update 2 uses an incompatible database for upgrading to version 6.0.
D.
vCenter Server Appliance 6.0 must be upgraded using the vSphere Web Client.
Explanation:
Explanation/Reference:
A is correct:
http://pubs.vmware.com/vsphere-60/topic/com.vmware.vsphere.upgrade.doc/GUID-34E5EB36-948A-42B5-949F-00412E1D1026.html
From Gunner’s article: Upgrades from vCenter Server Appliance 5.1 Update 3 and later to vCenter Server Appliance 6.0 are supported. To upgrade vCenter Server Appliance 5.0, you must first upgrade the vCenter Server Appliance to version 5.1 Update 3 or 5.5 Update 2 and then upgrade to vCenter Server Appliance 6.0