Question: When updating an existing MBS User Data Ingest Session at the Network Exposure Function (NEF), which HTTP method is used by an Application Function (AF) for partial modifications, targeting the URI of the corresponding "Individual MBS User Data Ingest Session" resource?
Option 1: HTTP POST with the `MBSUserDataIngSession` data structure
Option 2: HTTP PUT with the `MBSUserDataIngSessionPatch` data structure
Option 3: HTTP PATCH with the `MBSUserDataIngSessionPatch` data structure
Option 4: HTTP DELETE with the `MBSUserDataIngSession` data structure
Explanation: The correct answer is Option 3 because, according to standard practices in RESTful APIs (implied by the context of using HTTP methods for resource manipulation), HTTP PATCH is used for partial updates or modifications of a resource. This aligns with the requirement for updating an existing MBS User Data Ingest Session without replacing the entire resource, which would be done with HTTP PUT. The use of `MBSUserDataIngSessionPatch` data structure further supports this, as it implies a patch or partial update to the existing session.