Decision D6, which has three possible choices (X, Y, or Z), must be made in year 3 of a 6-year study period in order to maximize E(PW). Using an MARR of 16% per year, the investment required in year 3 , and the estimated cash flows for years 4 through 6 , determine which decision should be made in year 3 . The present worth of X is $ * The present worth of Y is $ The present worth of Z is $