What is an advantage for selecting Centralized ESRS over Integrated ESRS?

A.
External virtual machine is not required

B.
WAN compression is not required to Unity systems

C.
CHAP security is not required between Unity systems

D.
Internet connectivity is not required for every Unity system

Explanation:
The following requirements are related to the Integrated ESRS implementation only:
If your ESRS implementation will include a proxy server to connect to the Internet, you must indicate this
when you configure the ESRS feature.
If your ESRS implementation will include a Policy Manager for more control over remote access to your
storage system, you must indicate this when you configure the ESRS feature.
If your ESRS implementation will include a proxy server for your storage system to connect to a Policy
Manager, you must indicate this when you configure the ESRS feature
https://www.emc.com/collateral/TechnicalDocument/docu69327.pdf (page 12)