QUESTION $1$

Which of the following is true of software as a service $($SaaS$)?$

a$.$ It requires firms to buy licenses rather than merely renting software packages from vendors.

b$.$ It is software that functions exclusively in the cloud.

C$.$ It is software that allows HR to run its own reports and make changes with help from information technology staff.

d$.$ It functions in a vendor's data center and allows self$-$service.