Platform as a Service $($PaaS$)$ refers to $...$

Question $10$ options:

A$)$

subscribing to access of an infrastructure platform $($HW$,$ System SW and Telecom$)$

B$)$

subscribing to access to software such as Microsoft $365$

C$)$

subscribing to access of a virtual desktop

D$)$

subscribing to access a hardware infrastructure