Ensemble forecasting is a technique used by meteorologists to improve short$-$and$-$medium$-$range forecasts. Which of the following statements about ensemble forecasting is incorrect?

a$.$ As a forecast looks further into the future, the ensemble forecast plot is referred to as a spaghetti plot.

b$.$ Each simulation begins with slightly different weather information to reflect errors in the measurement.

c$.$ Meteorologists run several forecast models.

d$.$ Forecasters often run the same model several times altered variables.