It says class for class. You should get Class 7 level 2.
Why would you get a class 5?
Class 5 authorizes the holder to drive any motor vehicle including:
• any vehicle from Class 9;
• any two-axle motor vehicle except an ambulance, a taxicab or a bus;
• any three-axle motor vehicle, other than a truck, of a type designed for use in the construction, maintenance and repair of highways, whether or not the vehicle is to be so used; and
• to tow a towed vehicle which is registered up to and including 4,500 kg gross vehicle mass behind a motor vehicle or motor home referred to herein but not equipped with air brakes.