How is a safe water mark, that can be passed close aboard on either side, painted and lighted?

A safe water mark is designed to indicate that safe water lies ahead and can be passed on either side. The standard for marking safe water includes the specific painting and lighting requirements.

The correct choice emphasizes the characteristic colors of red and white stripes, which are a visual indication used in navigation to denote safe water. The addition of the Morse (A) light, which flashes the sequence of short and long signals, further aids in nighttime navigation and helps mariners identify the buoy from a distance.

This combination of paint and light serves to enhance visibility and acknowledgment of safe water areas, making it clear to boaters that these regions can be navigated without concern for underwater hazards. The use of the Morse (A) signal provides important information regarding the navigational marker, adding another layer of communication between the buoy and vessels, especially under low-visibility conditions.

Other options include different color schemes or lighting methodologies, which do not conform to the recognized visual standards for safe water marks.