A company has been using a CRM application that was developed in-house and is hosted on local servers. Due to internal changes, the company wants to migrate the application to the cloud without…

Software as a Service (SaaS) involves using a complete, pre-built application hosted by a third party, which would mean replacing their in-house developed CRM rather than migrating it.

Platform as a Service (PaaS) provides a complete development and deployment environment, abstracting away the underlying infrastructure management of servers, operating systems, and networking. This model is ideal for migrating existing custom applications where the company wants to manage the application itself but offload the infrastructure burden to the cloud provider.

XaaS (Everything as a Service) is a broad category encompassing various cloud services and does not specify a particular model that fits the requirement of migrating an *existing* custom app without infrastructure management.

Infrastructure as a Service (IaaS) provides virtualized computing resources but still requires the customer to manage the operating systems, applications, and some network components, which contradicts the goal of 'without having to manage the infrastructure'.