1?. A manager is considering opening a 116W grocery shop. Let Y=1 imply that the shop will be opened and CI otherwise. If the shop is opened, the sum of milk (denoted by X1) and bread [denoted by X2} delivered to the shop per day should be AT MOST 120 units. If the shop is not opened, such constraint will not be considered. Select the constraint that implements this. (M stands for a very.F big positive number and assume non-negative variables) A. X1 + X2 5121] + M*Y B. X1+X2120+M*{1-Y) C. X1 + X2 5120*Y D. X1 + X2 :1 120*(1- Y) 18. A telecommunication company,F wants to determine locations for base stations. The manager has gathered the following information. Cost perDay - $550 $480 $460 Using the information, Formulate a constraint to ensure area B being served as an IP. (21:,- = 1 when a base station is built on location ,1, 0 otherwise) A. x2 2 1 B. x2 +353 +x2+x5 :3 1 C. x3 + x4 3: 1 D. x1+x3 +x4+x53_== 1