Which cloud service model provides ready-to-use software accessed over the internet?

• A. SaaS
• B. IaaS
• C. PaaS
• D. Cloud storage

Answer: (A)

SaaS delivers fully functional software over the internet that you can use directly, usually through a web browser, with the provider handling hosting, updates, and maintenance. This means you don’t install or manage the software yourself—it's ready to use right away. In contrast, IaaS provides the underlying hardware and virtualized resources so you install and manage your own software on top of it, PaaS offers a development platform with tools to build and run apps while you manage the apps themselves, and cloud storage focuses on storing data rather than delivering a complete software application. Therefore, the ready-to-use software accessed over the internet is SaaS.