Final answer:
The airworthiness limitation includes both the limitations set by the manufacturer in the continuity instructions, and life-limited parts. Maintenance schedules do include these but cover a broader range. Thus, the correct answer is 'Both a and b'.
Step-by-step explanation:
An Airworthiness Limitation refers to the limitations which ensure the continued airworthiness of an aircraft. These can include, but are not limited to, mandatory replacement times, inspection intervals, or related procedures that must be complied with. The correct answer to the question 'Which of the following would be considered an Airworthiness Limitation?' is c) Both a and b. Both the limitations set out by the manufacturer in the instructions for continuing airworthiness and life-limited parts are considered to be Airworthiness Limitations. These are critical for maintaining the safety and legality of aircraft operations. Maintenance schedules approved under CAR 625 are indeed important for the upkeep of aircraft, but they are a broader category which includes but is not necessarily limited to the airworthiness limitations.