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)