Defining U as the Unemployment Rate And $\bar { u }$

Multiple Choice

Defining u as the unemployment rate and $\bar { u }$ as the natural rate of unemployment, we can write Okun's law as the following equation:

A) $\tilde { Y } = - 2 \times u$
B) $\tilde { Y } = - 2 \times ( u \times \bar { u } )$
C) $\tilde { Y } = 2 \times ( u - \bar { u } )$
D) $\tilde { Y } = - 2 \times ( \bar { u } \times u )$
E) $\tilde { Y } = - 2 \times ( u - \bar { u } )$