What information does the Unpaired Limited Data Block display?

The Unpaired Limited Data Block is specifically designed to display key information about untracked aircraft. The correct answer highlights that this block contains the beacon code and Mode C altitude, which are critical for identifying and understanding the position and intended flight level of aircraft that are not presently being tracked by radar.

This information helps air traffic controllers manage and integrate these untracked aircraft into the flow of air traffic. The beacon code allows controllers to recognize the aircraft uniquely, while the Mode C altitude provides essential information on the aircraft's vertical position, facilitating safe separation and coordination among multiple aircraft in the vicinity.

Other options, while related to air traffic control, pertain to different aspects that do not align with the specific function of the Unpaired Limited Data Block. They may involve other types of data that are displayed in different contexts or under different block types, further emphasizing the unique role that the Unpaired Limited Data Block plays in maintaining situational awareness for untracked aircraft.