Question: Which of the following is NOT a primary function of Subscription Management (SuM) in telecommunications networks?
Option 1: Validate user requests for service through registration, authentication, and authorization.
Option 2: Manage and maintain the physical infrastructure of access networks like UTRAN and GERAN.
Option 3: Collect, store, update, and distribute Service Profile information for users.
Option 4: Direct network resources to deliver services according to user profile information.
Explanation: SuM is focused on managing subscription-related aspects such as validating user service requests, handling service profiles, and directing service delivery based on those profiles. Managing the physical infrastructure of access networks (e.g., UTRAN, GERAN) is more related to network administration and maintenance rather than Subscription Management's core functionalities, which are centered around service provisioning and access control from a logical and administrative perspective.