Question: What is a key aspect of how a 3GPP network supports TV transport services via eMBMS (Evolved Multimedia Broadcast Multicast Services) broadcast, in terms of subscriber authentication?
Option 1: Mandatory authentication for all UEs (User Equipment), including those from other MNOs (Mobile Network Operators).
Option 2: Optional authentication, allowing an MNO to choose whether to authenticate a UE before providing the service or to enable reception without authentication.
Option 3: Authentication only for roaming UEs of other MNOs, not for subscribed UEs of the providing MNO.
Option 4: No provision for subscriber authentication for eMBMS broadcast services.
Explanation: This is correct because the 3GPP network specifications highlight flexibility in authentication for TV transport services via eMBMS broadcast. The network allows an MNO to authenticate a subscriber before providing these services (indicating authentication is not always mandatory) and also enables the MNO to allow UEs to receive eMBMS broadcast TV transport services without authentication, thus making authentication optional based on the MNO's policy.