Which feature is an advantage of HP Z420 workstations over Dell Precision T3610, Lenovo
ThinkStation S30, and Fujitzu Celsius M730?

A.
Energy Star qualification

B.
ISV certification

C.
liquid cooling option

D.
IPS Gen 2

Explanation:
http://h20331.www2.hp.com/Hpsub/downloads/Liquid_Cooling_HP_Z420_Z820_Workstations.pdf