Just take a picture of B2. Of course, you can also use A2. A2 includes B2. You know, let me explain the difference between A2 and B2 in detail. B2 can drive an ordinary truck, which is what the driver calls a bicycle. A2 can not only drive B2 cars, but also add trains, that is, semi-trailers. A2 is driving a semi-trailer dangerous goods vehicle.