1) Write a C program that consists of a main function and a sub function. Your main function prompt for and read in three integers from the keyboard. It should then call sub, passing it via the parameter mechanism the three integers. sub should determine the sum of the three integers and return it via a return statement. main should then display the theree integers and the sum like this: Three integers = _, _, _ sum = ___ Use 5, -3, 1 for the three integers