Final answer:
A spherical buoy can be numbered, lettered, green, or red, which are various markers for navigational purposes according to different buoyage systems.
Correct option is not given.
Step-by-step explanation:
A spherical buoy can serve numerous purposes including navigation, marking channels, or indicating hazards in maritime contexts.
When it comes to the coloring and marking of a buoy, they can be numbered, lettered, and also display specific colors such as green or red to convey different navigational meanings according to the International Association of Lighthouse Authorities (IALA) buoyage systems.
In the IALA B system, which is used in the Americas, parts of Asia, and Australia, green buoys mark the starboard (right) side of the channel when entering from the sea and red buoys mark the port (left) side.
In the IALA A system, used in Europe, Africa, and most of Asia, the colors are reversed.
Examples:
A spherical buoy could be numbered to show its position in a sequence along a navigational channel.
It might be lettered to provide identification that corresponds with maritime charts.
The buoy could be painted green to indicate the right side of the channel as per the IALA B system.
Or it might be colored red to signify the left side of the channel in the IALA B system or the right side in the IALA A system.
Correct option is not given.