To maximize scalability, ensure access to the latest software upgrades, and to control costs, many businesses that rely on enterprise systems (such ERP systems) to support their operations are transitioning to fully hosted versions of the enterprise systems applications available from ________ cloud services providers. 21

A) Software as a service (SaaS)

B) Platform as a service (PaaS)

C) Hardware as a service (HaaS)

D) Infrastructure as a service (IaaS)