Question: Which of the following best describes the operational mode of the radio link for Voice Group Call Service (VGCS) in a Public Land Mobile Network (PLMN)?
Option 1: Full Duplex Mode, supporting simultaneous two-way communication
Option 2: Half Duplex Mode, allowing one-way communication at a time among multiple users
Option 3: Simplex Mode, enabling only one-directional communication from the network to users
Option 4: Adaptive Duplex Mode, dynamically switching between full and half duplex based on user count
Explanation: The correct answer is Option 2 because VGCS in a PLMN context operates in half duplex mode on the radio link, allowing one-way communication at a time among multiple users, efficiently accommodating group speech conversation within network operational constraints.