Vehicle avehicle = new auto(); avehicle. moveforward(200); assume that the auto class inherits from the vehicle class, and both classes have an implementation of the moveforward method with the same set of parameters and the same return type. what determines which class's moveforward method is to be executed? a. the actual object type. b. the variable's type. c. the hierarchy of the classes. d. it is not possible to determine which method is executed.