With regard to the accuracy of the qualitative forecasting methods presented in the text, which one $(1)$ qualitative forecasting method seems to yield the worst overall accuracy when the forecasting accuracy for the short$-$term, intermediate term, and long$-$term are considered together $($hint: Table $11\mathrm{.}2$ may prove useful$).$

Select one:

a$.$ Market surveys forecasting method

b$.$ Time$-$series forecasting method

c$.$ Life$-$cycles analogy forecasting method

d$.$ Informed judgment forecasting method

e$.$ Delphi forecasting method