Question: What triggers the termination of the receive data process initiated by the `+VRX` action command in a User Equipment (UE)?
Option 1: Receipt of a specific `+VLS` command to stop audio data transmission
Option 2: Expiration of the inactivity timer or receipt of any command from the computer
Option 3: Completion of the entire audio data stream from the source
Option 4: Manual shutdown of the UE's audio interface
Explanation: The correct answer is Option 2 because, according to the specifications, the receive process initiated by `+VRX` is terminated either by the computer sending any command to the Terminal Adapter (TA), which interrupts the process, or by the time-out of the inactivity timer, indicating a period of inactivity. This highlights the importance of both external input and internal timers in managing data transmission states in telecom networks.