Referring to figure 1.1 of Jacobs, (the basic "T" depiction). The 3 major inputs to the Sales & Operations Planning (S&OP) process are Demand Planning (DP), Resource Planning (RP), and Finance/Executive/Strategy. The primary contribution of DP to S&OP is: a. The sales forecast for the period aggregated from all constituents. b. The capacity available from actual production after the last S&OP process to make demand for the period. c. The unconstrained demand forecasts from customers and additional product needs from New Product Development (NPD), spare parts planning, and other plants for the period d. The constrained demand for the period aggregated from all constituents vetted against historical capacities to produce