How does the given function improve the code versus if no function was present? def fahrenheit_to_celsius(fahrenheit): return (fahrenheit - 32.0) * 5.0 / 9.0 fahrenheit = float(input()) c1 = fahrenheit_to_celsius(fahrenheit); c2 = fahrenheit_to_celsius(32.0); c3 = fahrenheit_to_celsius(72.0); a. The use of the function makes the program run faster b. The use of the function decreases redundant code C. The use of the function reduces the number of variables in the code d. The function does not improve the code