Which feature in new to the HP Z440 workstation since its predecessor

A.
Full support for dual processors provides greater system performance

B.
All four front ports are USB 3.0 including a USB 3.0 changing port

C.
Two of the four front ports are USB 3.0 and two are USB 2.0

D.
Support for one 3D graphics card drives up to two independent displays for critical 3D
performance