What does the 'C' suffix indicate about an aircraft's transponder capability?

The 'C' suffix in the context of aircraft transponder capability specifically indicates that the aircraft is equipped with a transponder that has Mode C capability. Mode C is an enhancement to the basic transponder (Mode A) that provides altitude information in addition to the aircraft's identification code. With this capability, ATC can receive both the aircraft's position from its transponder and its altitude information, which is essential for maintaining safe separation in the airspace.

In this case, the correct answer affirms that the aircraft is equipped with a Mode C transponder, which facilitates a more accurate and efficient management of air traffic. The 'C' suffix signifies the presence of this specific transponder functionality, allowing ATC to more effectively track an aircraft's altitude and position.

It is also important to clarify that any options suggesting the absence of Mode C or indicating other capabilities without the inclusion of Mode C do not align with the definition of the 'C' suffix. For example, a transponder described as "no Mode C" would not satisfy the criteria for having the 'C' suffix, as it contradicts the fundamental purpose of what the suffix indicates regarding altitude reporting capability.