Consider the binary variables X5, X2 X3 X4, and xs where x; is defined as 1 if objecti is selected and 0 otherwise. Which of the following inequality models the requirement: Both X2 and X; are selected if xs is selected. Otherwise, at least one of x2 and xz is selected. A x2+x3 >= 1+x5 B) x2+x3 >= x5 x2 + x3 >= 2 D x2 + x3