Question: In a Voice Group Call Service (VGCS) scenario, when a talking subscriber is permitted to transmit application-specific data for a particular group ID, what action does the mobile station of the talking service subscriber take?
Option 1: It sends an APPLICATION DATA REQUEST message to the network on the downlink of the dedicated channel.
Option 2: It receives application-specific data from the network on the uplink of the group call channel.
Option 3: It sends a DATA INDICATION (Application_Data) message to the network on the uplink of the dedicated or group call channel.
Option 4: It initiates a new group call for transmitting application-specific data.
Explanation: In VGCS, when a talking subscriber is allowed to send application-specific data, the mobile station (MS) informs and transmits this data by sending a DATA INDICATION with Application_Data on the uplink (from MS to network), using either the dedicated or group call channel, ensuring all group members receive the data as intended.