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

What is an advantage of 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

Answer: D

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

References: https://www.emc.com/collateral/TechnicalDocument/docu69327.pdf (page 12)