Which intrusion detection system (ids) contains information about specific attacks and system vulnerabilities? select one: a. knowledge-based ids b. behavior-based ids c. threat-based ids d. risk-based ids

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