A large financial institution needs to implement a secure real-time messaging system to facilitate instant communication between traders and compliance officers. The system must ensure that all messages are encrypted during transmission and support comprehensive message archiving to comply with stringent regulatory requirements for financial record-keeping and audit trails. Which of the following protocols is the BEST choice to meet these requirements?

This scenario evaluates management-level decision making in Communication and Network Security. In CISSP exam scenarios, evaluate answers through executive governance, risk assessment, life safety, and due diligence before implementing technical controls.

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