What is a protocol?

A.
SnapRestore

B.
CIFS

C.
SnapMirror/SnapVault

D.
FlexClone

Explanation:
The Common Internet File System (CIFS) is protocol which is the standard way that computer users share files across corporate intranets and the Internet.
Incorrect: Not D: FlexClone is a technology to make fast, space-efficient copies of flexible volumes (FlexVol volumes) and LUNs.
Common Internet File System – TechNet
https://technet.microsoft.com/en-us/library/cc939973.aspx