If you multiply 141414 and 151515, what is the prime factorization of their product?
2×3×5×72 \times 3 \times 5 \times 72×3×5×7
2×7×152 \times 7 \times 152×7×15
6×356 \times 356×35
22×32×5×72^2 \times 3^2 \times 5 \times 722×32×5×7