Final answer:
The correct color for a triangular daymark is option c. Red. This coloration is used internationally to denote navigational markers that should be kept on the starboard side when returning from sea in the IALA-B region, and it varies in the IALA-A region, but the color is still singular, either red or green.
Step-by-step explanation:
A triangular daymark is a specific type of navigational aid that communicates important information to mariners about safe navigation.
When it comes to the color markings on a triangular daymark, there are specific colors designated for particular purposes based on international standards. The correct color for a triangular daymark, according to the International Association of Lighthouse Authorities (IALA), is option c. Red.
Daymarks are often used in conjunction with marine buoys to guide boats safely through various channels and around obstacles. The coloring is standardized to prevent confusion and ensure that mariners can quickly identify the type of marker and the directions it implies.
For example, in the IALA-B region, which includes the Americas, Japan, South Korea, and the Philippines, navigational aids such as buoys and daymarks use the color red to denote the starboard (right) side of a channel when returning from sea and green for the port (left) side. The triangular shape typically signifies that the marker should be kept on the starboard side.
In the context of the IALA-A region, which encompasses Europe, Africa, Australia, and parts of Asia, the lateral markers are reversed, but the triangular daymark would still use a single color, red or green, depending on the side it is indicating.
Because the question simply asks for the color(s) of a triangular daymark, without specifying a region, the most accurate answer would be the one that applies broadly to both IALA regions – option c. Red.