BOTH INTERNATIONAL & INLAND Which signal would a vessel aground show during daylight?

Correct Answer: Option C — Three black balls

Rule 30(d) requires a vessel aground to display three black balls in a vertical line during daylight. This specific shape configuration is universally recognized under both International and Inland Rules to indicate a vessel is aground, regardless of the vessel's length, provided it is not a small vessel in a special anchorage.