Which signaling devices meet the day and night requirements for boating?

The answer is supported by the fact that all the listed signaling devices are recognized as effective for both day and night usage in boating emergencies.

Three multi-star flares are designed to produce a bright light that can be seen from a long distance, making them suitable for signaling during both day and night. Hand-held red flares are also effective at attracting attention with their bright red color, highly visible in both scenarios. Additionally, a combination of one hand-held red flare and two parachute flares provides a versatile signaling method where parachute flares can illuminate the sky and indicate the boat's position, which is effective during night and can be perceived from a distance.

Together, these devices fulfill the signaling requirements dictated by boating safety regulations, ensuring that boaters have adequate means to alert others in case of emergencies at any time of day. Therefore, since each option contains valid signaling devices, it confirms that all of them meet the day and night requirements effectively.