A horse is blocking the front of a barn door, obstructing your view of the door. This configuration allows you to determine that the horse is closer to you than the barn door is. This is called

4. what is the reason for including the following code snippet in the header file animal.h? #ifndef animal_h #define animal_h class animal { public: animal(); animal(double new_area_hunt); void birth(); void hunt(double new_area_hunt); void death(); double get_area_hunt() const; private: double area_hunt; }; #endif