What is HP’s most expandable and powerful mobile workstation?

A.
HP EliteBook 8470w Mobile Workstation

B.
HP EliteBook 8570w Mobile Workstation

C.
HP EliteBook 8770w Mobile Workstation

D.
HP ProBook 8570w Mobile Workstation

Explanation:
Reference:http://www8.hp.com/nz/en/hp-news/pressrelease.html?id=1232180#.UGopO6T9FOg(Performance and power for professionals, second
paragraph)