Where are the coordinates of the foci for 25x2 + 9y2 - 50x - 36y - 164 = 0?

a. (1, -2) & (1, 6)
b. (-1, -2) & (-1, 6))
c. (-2, 1) & (6, 1)
d. (2, -1) & (-6, -1)