Final answer:
The correct answer is B) Software as a Service (SaaS), which delivers applications over the cloud using a pay-per-use revenue model, allowing users to access cloud-hosted software and pay based on usage.
Step-by-step explanation:
The option that delivers applications over the cloud using a pay-per-use revenue model is B) Software as a Service (SaaS). This model allows users to access and use software applications that are hosted in the cloud, which means they do not have to install the software on their own computers. Instead, they can use the software through an internet browser or a web-based app, and they pay only for the amount of time or resources they consume. This is a common approach for applications like email, customer relationship management (CRM) systems, and office productivity suites.