Your organization has signed an agreement with a web hosting provider that requires you to take full responsibility of the maintenance of the cloud-based resources. Which of the following models cover

In a PaaS model, the cloud or web hosting provider manages servers, networking, OS, and middleware, but the customer retains complete responsibility for deploying, configuring, and maintaining their application code, databases, and cloud-based resources. An agreement with a web hosting provider where the customer owns all resource maintenance maps to PaaS, because the customer controls the full application lifecycle on top of a provider-managed platform.

Software as a Service (SaaS) delivers fully managed applications where the provider handles software updates, patching, and infrastructure, leaving very little maintenance responsibility to the customer.

Functions as a Service (FaaS) is a serverless execution model where the provider manages compute scaling and runtime environments, and the customer only supplies small event-driven function code with minimal infrastructure oversight.

Infrastructure as a Service (IaaS) grants the customer the greatest control - including OS, storage, and networking configuration - but in the context of a web hosting agreement where the provider supplies a managed platform, IaaS does not match the described relationship.