Software as a Service (SaaS) - Offers ready-to-use software applications accessible over the internet, with the provider managing all updates and maintenance, ensuring high availability and minimal downtime.

Platform as a Service (PaaS) - Provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure typically associated with developing and launching an app.

Infrastructure as a Service (IaaS) - Offers basic compute, network, and storage resources on demand, over the internet, on a pay-as-you-go basis, requiring the company to manage the operating system, middleware, and applications.

None of the above - The company should consider an on-premises solution for better control over the supply chain management system.

Both A and B - SaaS for the supply chain management application and PaaS for any custom applications the company might develop in the future.