Question: What is the purpose of the Nudm_UECM_Re-AuthenticationNotification service operation in the 5G system?
Option 1: To request the AMF to perform a secondary authentication for a specific UE.
Option 2: To notify the UDM about the completion of primary authentication for a specific UE.
Option 3: To request the AMF to perform a primary authentication for a specific UE.
Option 4: To cancel an ongoing authentication process for a specific UE.
Explanation: The Nudm_UECM_Re-AuthenticationNotification service operation is used by the UDM to request the AMF to perform a primary authentication for a specific UE, as indicated by the required input of SUPI (Single User Plane Identifier). This operation is essential in ensuring the security and authenticity of user equipment in the 5G system.