Which mechanism allows you to make LUNs available to some initiators and unavailable to
others?

A.
LUN masking

B.
LUN grouping

C.
LUN cloning

D.
LUN hiding

Explanation:
http://en.wikipedia.org/wiki/Logical_Unit_Number_masking
Logical Unit Number Masking or LUN masking is an authorization process that makes a Logical
Unit Numberavailable to some hosts and unavailable to other hosts.