Consider the Following Short Run Aggregate Supply Equation

Consider the following short run aggregate supply equation:
, where Y is the real output is the full employment output, P and P^e are the actual and expected price levels, respectively. Which of the following is correct?

A) In the Keynesian model, P is always greater than P^e because of sticky-wage assumption.
B) In the Keynesian model, P is always equal to P^e because of sticky-wage assumption.
C) In the Keynesian model, P is always less than P^e because of sticky-wage assumption.
D) In the Keynesian model, P may be different than P^e because of sticky-wage assumption^.