ETX Enterprises offers Software as a Service $($SaaS$)$ to companies that lack in$-$house IT departments. Which of the following describes SaaS?

A$.$ Supplying online access over networks to storage devices and storage area network technology

B$.$ Managing applications, networks, storage, and security and providing website performance monitoring to subscribers over the internet

C$.$ Hosting and managing access to software applications delivered over the internet on a subscription basis

D$.$ Installing commercial, off$-$the$-$shelf software

E$.$ Developing proprietary software