Read the following code:
# Calculate average
average = numl + num2 + num3 / 3.0
There is an error in the code. How should the code be revised in order to get the correct output?
A:average = numl + num2 + num3 - 3.0
B:average = numl + num2 + num3 - 3.0
C: average = (numl + num2 + num3) / 3.0
D: average = numl + num2 + num3 / (3.0)