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

$\backslash$table$[[$Month$,$Forecast Demand,Actual Demand$],[$April$,160,180],[$May$,235,225],[$June$,240,215],[$July$,230,210],[$August$,220,250]]$

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

b$.$ more than $450$ but less than or equal to $500.$

c$.$ more than $500$ but less than or equal to $550.$

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