What is one major structural difference between a decision structure (such as a decoder) and a storage structure (such as an RS latch)?A. The storage structure requires a different class of gates. B. The storage structure requires a clock input. C. The storage structure uses feedback. D. The storage structure has no propagation delay.

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.