Which of the following statement accurately describe the weighted index, which is used with escalation to calculate cost estimate? (Select two that apply) A) The weight Index takes into account the historical outlay patterns of appropriations and inflation rates associated with fiscal years(FY) when cash flows out of the U.S. Treasure (outlay); C) The use the weight index to calculated the inflation adjusted forecast, combine the inflation rate data with the outlay rates; D) The weight index allows the comparison of costs over several years so that cost growths and impacts (e.g.,, learning curve) can be observed