Which data link exchanges M-Series messages using a full duplex point-to-point connection?

The correct answer is Link 11B because it is specifically designed to exchange M-Series messages over a full duplex, point-to-point connection. This type of connection allows for simultaneous two-way communication, enabling the rapid exchange of tactical data and enhancing situational awareness among military forces engaged in joint operations.

Link 11B provides a more advanced capability compared to its predecessor, Link 11A, which operates in a half duplex mode, meaning it can only send or receive data at any one time but not simultaneously. This makes Link 11B more efficient for real-time communication as it allows for continuous data flow without the delays associated with switching between sending and receiving.

Link 22 and NATO Link 1, while they serve important roles in tactical communications, do not utilize the same M-Series messages in the same manner as Link 11B. Link 22 further enhances the capabilities by incorporating additional features and operating in different ways suited for joint and coalition operations, but it does not fit the specific criteria of M-Series message exchange in a full duplex, point-to-point configuration like Link 11B does. Thus, Link 11B is the most appropriate answer for this question regarding data link operations.