What is a $$best practice$$ when using salesperson input as information for improving forecasting?

Group of answer choices

Ask the salespeople to forecast from a blank sheet of paper$/$computer screen first, then compare that forecast with the forecast generated by statisticians, and take the mean.

Use several waves of iteration between salespeople and planners until the two groups are within $1\%$ agreement, in order to maximize accuracy.

Take salesperson input with a grain of salt; salespeople are probably hedging in order to lower their quotas.

First send an initial forecast to salespeople, and then ask them to make adjustments.