class Car { private: string model; int wheels; double engine_size; int diagnostics(char system); public: string get_model(); bool is_running(); void set_wheels(int w); double accelerate(int fuel_rate); string vin; }; 以上是类Car的定义。假设有如下定义 Car myCar; 以下对myCar对象成员的访问哪些是合法的? A. myCar.vin = "5YJSA1DG9DFP14705"; B. myCar.wheels = 3; C. int r = myCar.diagnostics('e'); D. cout< E. myCar.set_wheels(3); F. bool b = is_running();