Final Answer:
Maintain historical data for Radar/PALS approaches by runway during the preceding five years. Option C is the answer.
Step-by-step explanation:
The correct option is (c) "Five years." According to aviation regulations and best practices, there is a requirement to maintain historical data for Radar/Precision Approach and Landing System (PALS) approaches by runway for a specified duration, which is five years in this case. This data includes information related to aircraft approaches, landings, and other relevant details.
Keeping a five-year historical record is crucial for analysis, auditing, and safety assessment purposes. It allows aviation authorities and operators to review and evaluate the performance of radar and PALS approaches over an extended period, identifying trends, addressing safety concerns, and making informed decisions to enhance the overall safety and efficiency of air traffic operations.
Option C is the answer.