Which suffix indicates that an aircraft has a transponder but no Mode C and is not equipped with DME?

The correct choice is the suffix that indicates that an aircraft is equipped with a transponder but does not have Mode C and is not equipped with Distance Measuring Equipment (DME). This particular suffix clarifies the capabilities of the aircraft to air traffic controllers.

The suffix indicates that while the aircraft has a basic level of transponder functionality, it lacks the additional capabilities that Mode C and DME provide. Mode C allows for altitude reporting, which is crucial for maintaining vertical separation between aircraft, and DME is used for determining distance from navigation aids, assisting with aircraft position reporting.

Understanding these distinctions is vital for air traffic controllers and pilots, as they rely on this information when coordinating airspace use, ensuring safety and efficiency in flight operations. The presence or absence of specific equipment can affect how air traffic control manages aircraft in various flight conditions.