With a ship built with a transverse framing system, by what means are double-bottom floors and the transverse frames joined?

Correct Answer: Option A — By way of bilge margin brackets.

Bilge margin brackets are essential structural components that connect the transverse floors to the side frames. This connection ensures the continuity of the vessel's transverse strength, effectively transferring loads from the side shell to the double-bottom structure at the turn of the bilge.