Which of the following methods are recognized forecasting techniques used in Human Resource Planning (HR

Core HRP Demand & Supply Forecasting Techniques: Human Resource Planning employs both qualitative (judgmental) and quantitative (mathematical/statistical) techniques to project headcount and skill requirements: Managerial Discussion / Judgment (A): A qualitative technique where bottom-up or top-down managerial estimates and expert judgments determine future staffing needs based on workload projections. Ratio-Trend Analysis (B): A quantitative technique where historical ratios between a operational variable (e.g., sales volume, production units) and required headcount are extrapolated into the future. Regression Analysis (C): A statistical forecasting technique that establishes mathematical relationships between business predictors (e.g., revenue, workload) and manpower demand. Delphi Technique (D): A structured qualitative forecasting method where a panel of experts anonymously responds to rounds of questionnaires until a consensus on future HR needs is reached.