Final answer:
Flight crew members of a 705 operation are required to have a mandatory rest period of at least seven hours within a certain cycle, often weekly, to comply with FAA regulations.
Step-by-step explanation:
The question relates to the regulations set by the Federal Aviation Administration (FAA) regarding mandatory rest periods for flight crew members on duty. According to the FAA regulations for 705 operations, flight crew members are required to have a rest period of at least 36 hours within a specified period. The information given does not specify this period, but typically such rules require the rest period within a seven-day cycle to prevent fatigue and ensure safe operation of aircraft.
The correct answer from the given options, based on the fact that the rest period must meet a minimum requirement, would be:
c. is at least seven hours.
This indicates that the mandatory rest period cannot be shorter than seven hours in duration within the unspecified cycle (commonly weekly).