What is the reason for including the following code snippet in the header file Car.h$?$

#ifndef CAR$\_$H

#define CAR$\_$H

class Car

$\{$

public:

Car$()$;

Car$($double speed$)$;

void start$()$;

void accelerate$($double speed$)$;

void stop$()$;

double get$\_$speed$()$ const;

private:

double speed$1$;

$\}$;

#endif

Question $20$ options:

To provide the implementation of the Car class

To define the interface for the Car class

To expose implementation details of the Car class to programmers of other classes

To make it possible for other programmers to use Car objects in an aggregation