What does NTSB stand for?

The abbreviation NTSB stands for the National Transportation Safety Board. This independent U.S. government agency is responsible for investigating transportation accidents across various modalities, including aviation, highway, marine, and rail. The NTSB's mission includes determining the causes of these accidents, making safety recommendations, and promoting improvements to enhance safety in the transportation sector.

The other options represent various configurations of words related to transportation and safety, but none match the established name of the agency. The correct designation, National Transportation Safety Board, reflects its specific focus on transportation-related safety investigations and its role in formulating recommendations that help prevent future accidents.