Question: In a Multiple-Operator Core Network (MOCN) scenario with service-layer security, what is required from the Application Function (AF) when creating broadcast MBS sessions or updating keys?
Option 1: The AF needs to generate and provide MSK, MSK ID, MTK, and MTK ID common to participating PLMNs.
Option 2: The AF only needs to select a MCC and MNC among the PLMNs for the Key Domain ID.
Option 3: The AF is not involved in key management or generation for broadcast MBS sessions.
Option 4: The AF must ensure that the UE does not compare received MCC || MNC to parameters at the radio level.
Explanation: In a Multiple-Operator Core Network (MOCN) scenario with service-layer security, the Application Function (AF) is required to generate and provide MSK, MSK ID, MTK, and MTK ID common to participating PLMNs when creating broadcast MBS sessions or updating keys. This ensures that all participating networks can securely access and manage the broadcast content.