A Time Series with Forecast Values Is Presented in the Following

A time series with forecast values is presented in the following table: $$\begin{array} { | r | r | r | } \hline \text { Month } & \text { Actual } & \text { Forecast } \\\hline \text { Jan } & 1 & \\\hline \text { Mar } & 1.2 & * \\\hline \text { May } & 1.15 & * \\\hline \text { Jul } & 1.25 & * \\\hline \text { Sep } & 1.3 & * \\\hline \text { Nov } & 1.275 & x \\\hline\end{array}$$
If the mean square error (MSE) until September is 0.01125, and the overall MSE is 0.010125,
Then x = ______.

A) 1.15
B) 1.25
C) 1.3
D) 1.25 or 1.3
E) 1.2 or 1.35