Question: Under what condition is the MCData-5 reference point NOT used for QoS control between the MCData server and the EPS?
Option 1: When the MCData service provider and the PLMN operator have an operational agreement for QoS control.
Option 2: In scenarios where multicast bearers are utilized for MCData services.
Option 3: If the Rx interface of the EPS is not supported according to specific technical standards.
Option 4: When there is no operational agreement between the MCData service provider and the PLMN operator for QoS control.
Explanation: The correct answer highlights a crucial condition where the MCData-5 reference point is not utilized: when there lacks an operational agreement between the MCData service provider and the Public Land Mobile Network (PLMN) operator for Quality of Service (QoS) control, emphasizing the importance of inter-operator agreements in facilitating direct QoS control for Mission Critical Data services over the Evolved Packet System.