Which of the following are best practices for managing folders? check all of the boxes that apply. a. avoid using subfolders. b. use a consistent naming scheme. c. rename the root folder to your user name. d. take advantage of the hierarchical structure of the file system. e. set folder access permissions.

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.