What is unique about HP Z1 Workstations?

A.
provides a nearly silent industrial designed workstation that fits into confined spaces

B.
provides a rugged design that passes Military Standard 810G testing

C.
is the only HP All-in-One Workstation and includes the first 27″ monitor and Intel Xeon
processors

D.
is the only HP All-in-One Workstation and includes dual processors, 16 memory slots, and 6-
channel SATA with RAID functionality

Explanation:
Reference:http://www.hp.com/unitedstates/campaigns/workstations/z1_features.html#.UGooq6T9FOg