1. Write a program in C where you would perform the following tasks: a. Write a main() function where you will declare an unsigned integer a. You can assign any value you like. (e.g. a = 4) b. Make a call to function factorial(). You will pass the unsigned integer you defined earlier as an argument to the function call. c. You will define a function called factorial() that takes in an unsigned integer parameter. This function should have an unsigned integer return type. d. Do not use a standard C function that calculates factorial. Instead write your own for loop that calculates the result. e. Print a statement in a similar format from main() as shown below. For example, if the number passed into the function is 4, you program should print the following: 4 factorial is 24.