According to Rule 5 of the International Regulations for Preventing Collisions at Sea (COLREGs 1972 / RIPA), what is required of every vessel regarding look-out?

1. Every vessel shall at all times maintain a proper look-out by sight and hearing as well as by all available means appropriate in the prevailing circumstances
2. A look-out is only required when navigating in fog or between sunset and sunrise
3. A look-out is solely the responsibility of the designated helmsman using visual sight alone
4. Vessels under 12 meters in length are exempt from maintaining a look-out in clear daylight