Where would you expect to find channels marked with the IALA-A Buoyage System?

Correct Answer: Option D — Australia

The IALA-A Buoyage System is utilized throughout Europe, Africa, and much of Asia and Oceania, including Australia. In contrast, the IALA-B system is used in North and South America, Japan, and the Philippines. Mariners must verify the regional buoyage system in use before entering foreign territorial waters.