Which two conditions would prevent an administrator from upgrading an existing vCenter Appliance to vSphere6.x? (Choose two.)

A.
The appliance has been configured to use an external Single Sign-On server.

B.
The administrator did not export the appliance configuration.

C.
The administrator is using an appliance with an embedded Platform Services Controller.

D.
The ESXi Host that the appliance will run on has not been placed into Maintenance Mode.

Explanation: