Determine the number of slack variables and name them Then use the slack variables to convert each constraint into a linear equation B How many and which slack variables should be assigned OA There are three slack variables named X X2 S1 B There are five slack variables named X1 X2 1 2 3 OC There are two slack variables named 2 OD There are three slack variables named S1 S2 S3 Maximize z 6x 3x subject to with 9x1 X2 176 15x 6x2 229 14x x 307 x 20 X 20