Software as a Service (SaaS) would be ideal as it eliminates the need for managing the infrastructure and provides the application ready to use.

Platform as a Service (PaaS) offers a managed environment with built-in tools for development, testing, and deployment, abstracting the underlying infrastructure.

Infrastructure as a Service (IaaS) provides the most control over the infrastructure but requires the company to manage more aspects of the environment.

None of the above as the company's requirements are too specific for standard cloud service types.

Both Platform as a Service (PaaS) and Infrastructure as a Service (IaaS) could meet the company's needs depending on their preference for control versus convenience.