Suppose there is a class alarm. alarm has two class variables, code which contains a string value representing the code that deactivates the alarm, and armed which contains a boolean describing whether or not the alarm is activated.
alarm has a function disarm that changes the value of armed to false if the user gives a parameter containing the string that represents the alarm's code. call the disarm function on the alarm object myalarm and give it the code "93478".

1)consider the following code snippet: #ifndef book_h#define book_hconst double max_cost = 1000.0; class book{public: book(); book(double new_cost); void set_cost(double new_cost); double get_cost() const; private: double cost; }; double calculate_terms(book bk); #endifwhich of the following is correct? a)the header file is correct as given.b)the definition of max_cost should be removed since header files should not contain constants.c)the definition of book should be removed since header files should not contain class definitions.d)the body of the calculate_terms function should be added to the header file.