What does the acronym "CDL" stand for?

The acronym "CDL" stands for Commercial Driver's License. This license is specifically designed for individuals who operate large or heavy vehicles, such as trucks and buses, for commercial purposes. Obtaining a CDL requires meeting specific state and federal requirements, including passing written and driving skills tests to ensure that the driver is knowledgeable about safe driving practices and regulations.

While the other options include similar terms, they do not accurately represent the regulatory framework and designation used across the United States for professional drivers. Therefore, the correct answer highlights the precise terminology utilized within the driving and transportation industry.