Which statement correctly describes cloud computing services IaaS, PaaS, and SaaS?

Which statement correctly describes cloud computing services IaaS, PaaS, and SaaS?

• A. IaaS provides software as a service.
• B. PaaS provides infrastructure.
• C. SaaS provides platforms.
• D. Cloud computing delivers resources over the internet; IaaS provides infrastructure, PaaS provides platforms, and SaaS provides software.

Answer: (D)

Cloud service models organize resources into layers that map to who handles what. In IaaS you get the basic infrastructure—virtual machines, storage, and networks—so you manage the operating system and applications yourself. In PaaS you’re given a platform to develop, deploy, and manage apps without worrying about the underlying hardware or runtime, which handles much of the setup for you. In SaaS you access ready-made software applications hosted by the provider, with maintenance taken care of. The statement that best fits these ideas describes cloud computing as delivering resources over the internet, with IaaS providing infrastructure, PaaS providing platforms, and SaaS providing software. The other options mislabel the services relative to the layers they belong to.

Cloud service models organize resources into layers that map to who handles what. In IaaS you get the basic infrastructure—virtual machines, storage, and networks—so you manage the operating system and applications yourself. In PaaS you’re given a platform to develop, deploy, and manage apps without worrying about the underlying hardware or runtime, which handles much of the setup for you. In SaaS you access ready-made software applications hosted by the provider, with maintenance taken care of. The statement that best fits these ideas describes cloud computing as delivering resources over the internet, with IaaS providing infrastructure, PaaS providing platforms, and SaaS providing software. The other options mislabel the services relative to the layers they belong to.