What type of code is this and what is it used for?

def stepsToCalories(num_steps): pass

a. Used to fool the interpreter when looking at code complexity.

b. Functional Tab, we use it to seperate sections of the code.

c. Functional Tab, we use it as a place holder as we develop the code so we can test the code incrementally as we build it.

d. Syntax error, and we use it to test if the editor sees the error correctly