What is the correct way of declaring a class 'car' which has three public attributes: color, model and type in C$++$:

$$ class car string color; string model; string type $\}$

class car $\{$public: string color; string model; string type$\}$

class car $\{$public: string color; string model; string type$\}$;

class car $\{$ public: string color$=$"red"; string model; string type$\}$;