What cost-effective solution component enables branch office workers to continue collaborating
with each other and making external calls even when the corporate network is unavailable?

A.
Survivable Branch Communication zl Module powered by Lync

B.
HP Intelligent Management Center

C.
Redundant IT Infrastructure at the branch office

D.
Redundant Branch Office Network switches

Explanation:

Reference:
http://h17007.www1.hp.com/docs/one/4AA0-8924ENN.pdf