A forecast for the first six months of the year revealed a tendency to underpredict the actual demand for the revitalized Hubig$$s Pies plant in the Marigny.

Month Actual Forecast

January $675600$

February $720700$

March $640620$

April $510495$

May $480410$

June $565535$

What is the mean squared error of this forecast?

a$.1,469$

b$.1,694$

c$.1,873$

d$.2,075$