Final answer:
The Pilot-in-Command must have completed three take-offs and landings to a full stop at night within the preceding 90 days, in an aircraft of the same category, class, and if required, type.
Step-by-step explanation:
If passengers are to be carried during the period from 1 hour after sunset to 1 hour before sunrise, the Pilot-in-Command (PIC) must have made at least three take-offs and landings to a full stop during the preceding 90 days in an aircraft of the same category, class, and type (if a type rating is required), and if the take-offs and landings are to be performed in a tailwheel airplane, they must have been to a full stop in an airplane with a tailwheel.
This regulation is critical to ensure the PIC's proficiency in night flying conditions, thereby enhancing the safety of nighttime flights. It is important to note that for carryover of currency, these take-offs and landings must have been done at night (the period of time from one hour after sunset until one hour before sunrise).