Question: In a Mission Critical (MC) service scenario, what is the primary purpose of using a functional alias as a target address when initiating a private call towards a partner MC system?
Option 1: To enable interoperability between different MC systems for secure group communications.
Option 2: To facilitate direct communication between MC service users across separate MC systems without revealing individual identities.
Option 3: To prioritize emergency calls over regular communications within the same MC system.
Option 4: To manage resource allocation for MC services within a single network infrastructure.
Explanation: The correct answer, Option 1, highlights the key benefit of using functional aliases in this context: enabling interoperability. This is crucial for Mission Critical Communications as it allows for seamless cooperation and communication between different MC systems, which might belong to various organizations or jurisdictions. While Option 2 touches on a potential benefit (privacy), it's not the primary purpose in the context of **inter-system** communications. Options 3 and 4 are unrelated to the use of functional aliases in inter-MC system communications.