The uploaded study guide identifies C. Experience Cloud as the correct solution.
The defining requirement is an external-facing digital site through which users can interact with Salesforce-supported service capabilities. The users need a customer-accessible interface for case management, Knowledge discovery, and support interactions.
Experience Cloud fits the scenario because the question is fundamentally about creating the external digital experience through which those capabilities are exposed.
Option B, Service Cloud, is closely connected with case management, Knowledge, and customer-service functionality, but the question is not simply asking which cloud provides internal service operations. It specifically asks which cloud should be used to design the external-facing site.
Option A, Commerce Cloud, is associated primarily with digital commerce experiences and does not match the support-site scenario described.
The examination distinction is therefore between the underlying business capability and the delivery experience. Service functionality may support the processes behind the scenes, while Experience Cloud provides the customer-facing environment through which users interact with those services.
Study Guide reference/topics: Experience Cloud, external sites, Cases, Knowledge, customer support, Declarative Design.
==================================
