Which printers have an automatic firmware update feature that helps the customer future proof
their printer and take advantage of updates from HP?

A.
all HP Designjet printers

B.
all PostScript printers

C.
all Z series printers

D.
All ePrinters

Explanation:
http://www.hp.com/hpinfo/newsroom/press_kits/2013/HPatPRINT13/Z5400_NewsAdvis
ory_FINAL.pdf(page 2, first para)