Final answer:
The most common license issued by the RMV in Massachusetts is the Class D license, used by regular drivers for personal use, unlike the commercial-oriented Class A, B, and C licenses.
Step-by-step explanation:
The Registry of Motor Vehicles (RMV) in the Commonwealth of Massachusetts issues several classes of licenses to cover different types of vehicles and driving professions. Among them, the most common license is the Class D license. This license type is used by the majority of drivers as it covers the operation of regular passenger cars for personal use.
The other classes, such as Class A, B, and C, are generally intended for commercial purposes and include the operation of larger vehicles such as trucks and buses, each with specific requirements and limitations based on vehicle weight and the number of passengers. Understanding the differences between these classes is important for drivers to ensure they are licensed appropriately for the vehicles they intend to operate.