All of the Following Are Characteristics of Software-As-A-Service (SaaS)except

All of the following are characteristics of software-as-a-service (SaaS) except:

A) SaaS is an increasingly popular IT model for large but not small companies in which software is available to users as needed.
B) The SaaS model was developed to overcome the challenge to an enterprise of being able to meet fluctuating demands on IT resources efficiently.
C) Other terms for SaaS are on-demand computing,utility computing,and hosted services.
D) Usually there is no hardware and software to buy since the apps are used over the Internet and paid for through a fixed subscription fee,or payable per an actual usage fee.