Question: In a Voice Group Call Service (VGCS) scenario, where the network option for immediate distribution of application-specific data by the BSS is activated, what is a consequence for the MSC's ability to perform a specific check during the call establishment phase?
Option 1: The MSC can more accurately perform location updates for all subscribers in the group call.
Option 2: The MSC is unable to verify the sending subscriber's subscription for the specific group ID.
Option 3: The MSC must always include the mobile subscriber's MSISDN in the NOTIFY APPLICATION DATA message.
Option 4: The MSC can only distribute application-specific data to cells outside the BSC area.
Explanation: When the network option for immediate distribution of application-specific data by the BSS is activated, it implies that the BSS distributes data without waiting for further instructions from the MSC. This setup prevents the MSC from performing a subscription check for the sending subscriber's group ID in real-time during the call establishment phase, as the data distribution to cells within the BSC area happens immediately without awaiting MSC verification.