Study the following class definition:

class Car

$\{$

public:

Car$($double speed$)$;

void start$()$;

void accelerate$($double speed$)$;

void stop$()$;

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

private:

double speed;

$\}$;

Which of the following options would make logical sense in the definition of the void accelerate$($double speed$)$function$?$

Question $5$ options:

this$->$speed $=$ this$->$speed;

speed$1=$ this$->$speed;

this$->$speed $=$ speed;

this.speed $=$ speed;