Consider the following code segment:

import os
filename = input("Enter the name of a file: ")
if :
print("That file exists!")
else:
print("That file does not exist.") This code segment is supposed to print an appropriate message indicating whether or not the file specified by the user exists.

What code should be placed in the blank so that the code segment performs its intended task?

a. filename != ""
b. os. path. exists()
c. os. path. exists() == filename
d. os. path. exists(filename)

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.