Which computer that competes with HP Z230 workstations has only one DisplayPort port?

A.
Lenovo ThinkStation E31 SFF workstation

B.
Dell Precision T1700 SFF workstation

C.
Apple iMac 27

D.
Fujitsu Celsius W530 workstation

Explanation:
http://www.caddigest.com/exclusive/CAD_hardware/041913_lenovo_thinkstation_e31.h
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