A Mississippi Farmer Is Considering Adding a Special Breed of Bull

Multiple Choice

A Mississippi farmer is considering adding a special breed of bull to his farm. Let $X_{1}=1$ imply that the bull will be purchased and 0 otherwise. If it is purchased, then the pounds of organic soy purchased per day (denoted by $\mathrm{X}_{2}$ ) and the pounds of organic corn purchased per day (denoted by $\mathrm{X}_{3}$ ) should be at least 50. If the bull is not purchased, this constraint will be immaterial. The constraint that implements this would be ( $\mathrm{M}$ stands for a very big positive number and assume non-negative variables)

A) $X_{2}+X_{3} \geq 50+M * X_{1}$
B) $X_{2}+X_{3} \geq 50+M *\left(1-X_{1}\right)$
C) $X_{2}+X_{3} \geq 50 * X 1$
D) $X_{2}+X_{3} \geq 50 *\left(1-X_{1}\right)$