"A set of business processes, backed up by information technology, in which supply chain partners agree to mutual business objectives and measures, develop joint sales and operational plans, and collaborate to generate and update sales forecasts and replenishment plans" is the definition of

A$.$ tracking signal.

B$.$ collaborative planning, forecasting, and replenishment $($CPFR$).$

C$.$ multiple regression.

$$ D$.$ causal forecasting model.