Which of the following constraints correctly describe this requirement: The management also requires produce at least one kg of product 2 (denoted by X2) for every five kgs of product 1 (denoted by X1).
a. 5X1 + X 2 ≥ 0
b. X1 + 5 X 2 ≥ 0
c. X1 + 5 X 2 ≤ 0