Write a C program where you declare and initialize two global integer variables A and B. Write function whatPercentage( ) that calculates the percentage of B that A represents. The function whatPercentage( ) does not take any input parameters and returns the result of an expression containing A and B. In the main( ) body of your program, write the following in this exact logical order: 1. Invoke whatPercentage( ) and print its result. 2. Assign new values to A and B. 3. Invoke whatPercentage() again and print its result. 4. Add a comment to your code that precisely states what differences you observed in the two invocations of the function, and to what concept would you attribute this behavior. 5. To the global declaration of A and B, add the keyword const as 'const int A=1 '. What happens when you run your program now. Add a comment to your code that states your observations for this part. Please comment out the keyword const when you submit your code