Firewalls are
a. a system to recover data during transaction processing.
b. special software used to screen Internet access.
c. a system that enforces access control between two networks.
d. special materials used to insulate computer facilities.

Idon understand these and need some ! ?

Which of the following is not contained on the slide show toolbar? a. next button b. slide button c. close button d. pen tool

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.