The system displays proximity traffic indicated by a filled white diamond when the intruding aircraft is within how many feet?

The system indicates proximity traffic with a filled white diamond when an intruding aircraft is within 1,200 feet. This specific range is critical for situational awareness and collision avoidance during flight. The filled white diamond serves as a visual cue for pilots to be aware of nearby aircraft that may pose a risk, prompting them to take necessary precautions if needed. Understanding this threshold is vital for maintaining safety in the airspace.

The incorrect options reflect other distances that are not applicable to the specific indication of a filled white diamond in the traffic display system. Hence, knowing that 1,200 feet is the limit for this warning allows pilots to respond appropriately.