Write a function header for each function below:
(a) A function named sum_avg() that takes in three floating-point numbers and sends back their sum and average via arguments by reference.
(b) A function named sum_avg() that takes in three floating-point numbers and sends back their sum with the return statement and their average via argument by reference.
(a) A function named sum_avg() that takes in three floating-point numbers and sends back their sum and average via arguments by reference.
(b) A function named sum_avg() that takes in three floating-point numbers and sends back their sum with the return statement and their average via argument by reference.
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