Question

If A = {2, 4, 6, 8, 10...} and B = {1, 3, 5, 7, ...}, what is A ∩ B?

{2, 4, 6, 8, ....}
{ }
{1, 2, 3, 4, 5, ...}
{1, 3, 5, 7, ....}