What is the biggest difference between HP Critical Advantage and HP Proactive Select?

A.
Critical Advantage includes hardware and software, while Proactive Select only includes
hardware.

B.
Critical Advantage is integrated with Mission-Critical Partnership, while Proactive Select is not.

C.
Critical Advantage includes reactive support, while Proactive Select does not.

D.
Proactive Select includes 24×7 access to HP technical experts, while Critical Advantage does
not.

Explanation:
Reference:http://www.computerworld.com.au/blog/analysts-corner/2011/02/22/hp-looks-criticaladvantage-support-services/(Go to Market, first paragraph)