A company wants to construct a new central distribution center (DC) to supply products to two regions. The coordinates of region A are (200, 50) and the coordinates of region B are (100, 150). The product demand from region A is 75 units, while that of region B is 70 units. Using the center-of-gravity method, which of the following coordinates correspond to an optimal location for the new DC?
1) (50, 200)
2) (100, 150)
3) (150, 100)
4) (200, 150)