Software as a Service is the cloud model used when employees need to consume an application without installing, managing, patching, or updating the software themselves. The provider operates the application and supporting infrastructure, and users access the service through a browser or client. That is exactly the scenario described: occasional software use without local installation and administrative overhead. Infrastructure as a Service would still require the organization to manage operating systems and applications on virtual machines. Platform as a Service is aimed more at application development and runtime environments. The business-process option is not the standard CCNA cloud service model answer here. Cisco CCNA 200-301 v1.1 Network Fundamentals expects candidates to distinguish SaaS, PaaS, and IaaS by responsibility boundary. If the customer simply uses the finished application, the model is SaaS. The correct recommendation is software-as-a-service.