Referring back to the forecasting options from Table $8\mathrm{.}1,$ which is the most correct, Options A$,$ B$,$ or C$,$ with respect to a$)$ over$-$running the estimate, and b$)$ under$-$running the estimate? There is not an exact answer here, but some are more correct than others.

Forecasting option $\text{'}$A$\text{'}$ forecasts the original total estimate.

Forecasting option $\text{'}$B$\text{'}$ forecasts the current productivity trend.

Forecasting option $\text{'}C\text{'}$ forecasts the original productivity rate.

A variance of $-$ MHs indicates an over$-$run in cost and a $+$ MH indicates an under$-$run in cost$.$