The mean square error $($MSE$)$ for the forecasts shown in the following table is:

$\backslash$table$[[$Month$,$Forecast Demand,Actual Demand$],[$April$,170,180],[$May$,225,200],[$June$,210,200],[$July$,260,240],[$August$,200,230]]$

a$.$ more than $250$ but less than or equal to $300.$

b$.$ more than $300$ but less than or equal to $350.$

c$.$ more than $350$ but less than or equal to $400.$

d$.$ more than $400$ but less than or equal to $450.$