What is the benefit of configuring Datastore Sync between SteelHeads?

What is the benefit of configuring Datastore Sync between SteelHeads?
A . It allows up to four SteelHeads in a cluster access to the same datastore
B . It gives high availability to the warm data patterns in exactly two SteelHeads
C . It allows for seamless transition when upgrading to a larger SteelHead
D . It allows for seamless transition from a physical to a virtual SteelHead
E . It allows more efficient use of references by synchronizing them end-to-end between branch and datacenter

Answer: E

Explanation:

Reference: https://support.riverbed.com/bin/support/static/d6j3tb1i55ni1erbjp6e3fln9v/html/mhmppa9t9gq3laicvt0r91b1n7/sh_cx_9.2_ug_html/index.html#page/sh_cx_9.2_ug/setupServiceDatastore.html