Use this information for two questions. A vaccine is manufactured in Kalamazoo, Michigan (K). From there it is flown to one of four cold storage locations (A,B,C,D), and then trucked via special refrigerated trucks to 30 major distribution cities (1, 2, ... 30). Let xij be the amount of vaccine (in thousands of doses per day) shipped from i toj. Assume this is formulated as a transshipment problem. The constraint for cold storage location B should be: None of these XKB - XB1 - XB2 - XB3 .-XB30 = 1 XKB - XB1 - XB2 - XB3... -XB30 = = 0 XKA + XKB + XKc + XKD-X81-XB2 - ... - XB30 = 0 XKA - XKB - XKC - XKD = 0 XKA - X - X - X = 1 Not counting non-negativity constraints, the number of constraints needed to make a standard transshipment formulation would be: 3 35 30 None of these 04 How many decision variables are there in the linear programming formulation of this problem? 8 04 3 12