Go to the Field Set Styles section and create a style for all fieldset elements that removes the field set border, sets the width to 60%, and sets the top/bottom margin to 10 pixels and the left/ right margin to 0 pixels. For every field set legend, create a style rule that sets the background color to rgb(232, 232, 232), sets the width to 100%, and sets the top/bottom margin to 2 pixels and the left/right margin to 0 pixels.

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.