Question $6(10$ points$)$

In a car rental application, the following car class interface is defined. One of the programmers discovers a bug in the void accelerate $($double speed$)$ function. She corrects the bug by modifying the code snippet in the implementation of the Car class accelerate function. What must be changed in the interface?

class Car

$\{$

public:

void start$()$;

void accelerate$($double speed$)$;

void stop$()$;

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

private:

double speed;

$\}$;

The accelerate$($double speed$)$ declaration must be updated.

A new private acceleration data member must be added.

The accelerate function must be declared as void accelerate$($double acceleration$).$

No change is required in the interface because only the implementation was modified.