Answer: PaaS(Platform as a service)
Step-by-step explanation: Platform as a service(PaaS) is the cloud computing feature that provides the service for developing the application through a third party supplier .The service provided is usually in the form of software and hardware tools on the internet platform.
Sean is the PaaS provider in the mentioned situation according to the question.He is providing the operating system and DBMS service to Olivia for her business processing .