What are two valid use cases for vCenter Server Linked Mode?

What are two valid use cases for vCenter Server Linked Mode? (Choose two.)

A.
An administrator wants to migrate virtual machines between vCenter Server instances.

B.
An administrator wants to define roles once and have them applied to all vCenter Server instances.

C.
An administrator wants to manage ESX/ESXi hosts from multiple vCenter Server instances.

D.
An administrator wants to search all inventory objects across multiple vCenter Server instances from one vSphere Client