Evaluate the running average y[n] for the unit-step input signal. Make a plot of u[n] before working out the answer. Which of the following options correctly describes the running average for the given input?

A) The running average is equal to L-1.
B) The running average is equal to \Sigma xn-k.
C) The running average is equal to 0 for n < 0 and 1 for n >= 0.
D) The running average is equal to u[n].