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Factor completely 625x4 − 81.

(5x − 3)(5x − 3)(25x2 + 9)
(5x − 3)(5x + 3)(25x2 − 9)
(5x + 3)(5x + 3)(25x2 + 9)
(5x − 3)(5x + 3)(25x2 + 9)