it is observed that the forecast method did not accurately predict the actual demand. Specifically, the forecast errors were found to be:

Mean absolute percent error $=10\%$

Cumulative sum of forecast errors $=0$

Which one of the statements concerning this forecast is true?

Select one:

A$.$ The forecast has no bias but has a positive standard deviation of errors.

B$.$ The forecast has a positive bias and a standard deviation of errors equal to zero.

C$.$ The forecast has a positive bias and a positive standard deviation of errors.

D$.$ The forecast has no bias and has a standard deviation of errors equal to zero.