What is a benefit of vCenter Linked-Mode?

A.
Allows the vCenter Server Virtual Appliance (vCSA) to manage multiple sites

B.
Pools vRAM entitlement

C.
Increases vCenter security

D.
Increases vCenter reliability

Explanation:
http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.vcenterhost.doc_50%2FGUID-EC40636E-0DD4-4A17-B163-5CFBDC31666C.html