You have been asked to select among 7 possible sites for oil exploration. Designate cach site as S1, S2, S3, S4,S5,S6, and $7. Assuming that Siis a binary variable. The constraint for the restriction "Evaluating sites $2 or S5 will prevent you from assessing site 84." O S4 S5 SI. $2+S431 S2 + S5+S4 S5 $2. OS2 +S4 S 1, S4 S5 S 1