Let A = set of all divisors of 8100 and B = set of all divisors of 21600. What is the product of the elements of AUB?

1) 2^36 × 3^54 × 5^36
2) 2^72 × 3^108 × 5^72
3) 2^189 x 3^144 x 5^81
4) Very lengthy answer.None of the above