How are fully provisioned desktops created for automated pools, whether floating or dedicated?

How are fully provisioned desktops created for automated pools, whether floating or dedicated?

A.
They are deployed from a pre-configured template

B.
They are cloned from an existing desktop

C.
They are deployed form an existing .ISO image

D.
They are created from scratch

Explanation:
http://pubs.vmware.com/view-51/topic/com.vmware.ICbase/PDF/view-51-architectureplanning.pdf(page 10, 6th bullet)