What does the acronym CDL stand for?

The acronym CDL stands for Commercial Driver's License. This designation is a specific regulatory term that refers to the license required to operate commercial motor vehicles in the United States, including large trucks and buses. The reason "Commercial Driver's License" is the correct choice is that it accurately reflects the nature of the document, which is issued to individuals who meet certain qualifications, training, and testing requirements to ensure they are capable of safely operating these types of vehicles.

Other options such as "Commercial Driving License," "Certified Driver's License," and "Commercial Delivery License" do not capture the precise legal terminology used in the U.S. regulations governing commercial driving. For instance, while "Commercial Driving License" might seem similar, it fails to use the possessive form that emphasizes the driver's qualifications. Options like "Certified Driver's License" and "Commercial Delivery License" are misleading since they suggest a different scope of driver qualification or vehicle operation that is not aligned with the regulatory framework established for commercial drivers.