Defining $Y _ { t}$ As Current Output $\bar { Y } _ { t }$

Defining $Y _ { t}$ as current output, $\bar { Y } _ { t }$
As potential output, and $\tilde { Y } _ { t }$
As short-run fluctuations, how can the equation $\tilde { Y } _ { t } = \left( Y _ { t } - \bar { Y } _ { t } \right) / \bar { Y } _ { t }$
Be best defined?

A) the percentage deviation of current output from potential output
B) the difference between current output and potential output
C) the percentage deviation of potential output from current output
D) the deviation of current output from potential output
E) the difference between potential output and current output