Your development team is using pre-configured and deployed web, database, and application
servers installed as virtual machines in your company cloud. Which type of service are they using?

A.
Software as a Service (SaaS)

B.
Platform as a Service (PaaS)

C.
Data Processing as a Service (DPaaS)

D.
Infrastructure as a Service (IaaS)

Explanation:
http://docs.hol.vmware.com/HOL-2013/HOL-SDC-1314_html_en/