Illinois CDL Practice Exam.

The correct answer is Class A. This classification is specifically for combination vehicles that have a Gross Combination Weight Rating (GCWR) of 26,001 pounds or more while towing another vehicle that weighs over 10,000 pounds. Class A licenses are required for drivers who operate such heavy and complex vehicles, which may include tractor-trailers, truck and trailer combinations, and other large vehicles that meet these weight specifications. The other classes are intended for different vehicle types or weight capacities. Class B is for single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, but does not cover towing heavy trailers beyond the specified limits. Class C is designed for smaller vehicles, typically under the thresholds that require a Class A or B license, while Class D usually pertains to standard passenger vehicles that don't meet the heavy or combination specifications necessary in the context of this question.