Which form factors are available for HP Z1 workstations?

A.
mobile and all-in-one

B.
all-in one only

C.
small form factor only

D.
all-in-one tower and small form factor

Explanation:
http://h10010.www1.hp.com/wwpc/pscmisc/vac/us/product_pdfs/Z1_Datasheet.pdf