Question: What is the primary outcome for a subscriber's device when they initiate the 'Leaving' process in the context of Multimedia Broadcast/Multicast Service (MBMS)?
Option 1: The device starts receiving all available MBMS bearer services in unicast mode.
Option 2: The device stops receiving Multicast mode data for the specific MBMS bearer service from which the subscriber is leaving.
Option 3: The device's subscription to all MBMS services is automatically cancelled.
Option 4: The device begins to transmit multicast data for the MBMS bearer service it is leaving.
Explanation: When a subscriber initiates the 'Leaving' process, they are essentially opting out of receiving further Multicast mode transmissions for a specific MBMS (Multimedia Broadcast/Multicast Service) bearer service. This action does not affect their subscription to other MBMS services nor does it trigger a switch to unicast mode for the left service or involve the device in data transmission. Thus, the primary outcome is that the device ceases to receive multicast data for the specified service.