Which of the following is best described as a model of "Software$-$as$-$a$-$Service" or "SaaS"?

is a cloud computing service model in which company installed and runs on computers on the premises using the software, rather than at a remote facility such as a server farm or cloud.

is a cloud computing service model in which company provides a complete, flexible and cost$-$effective cloud platform for developing, running and managing applications.

is a cloud computing service model in which company that rents cloud$-$based software applications that customers can access via the Internet.

is a cloud computing service model in which company leverages computing resources are hosted in a public cloud, private cloud, or hybrid cloud.