Question: What is the primary function of an MC Gateway Server in a Mission Critical Data (MCData) system when interacting with a partner MCData system in a different trust domain?
Option 1: To directly expose MCData servers to external trusted domains for simplified access.
Option 2: To act as a proxy, hiding the topology of one or more MCData servers while facilitating interconnection services.
Option 3: To manage user authentication across different trust domains for MCData services.
Option 4: To optimize media transmission by bypassing call control signaling.
Explanation: The MC Gateway Server acts as a proxy, ensuring the security and integrity of the MCData system by hiding its internal topology from external trust domains, which is crucial for mission-critical communications where security and reliability are paramount.