If A = {1, 2, 5, 6} and B = {1, 2, 3}, then what is (A × B) ∩ (B × A) equal to?

1
{(1, 1), (2, 1), (6, 1), (3, 2)}
2
{(1, 1), (1, 2), (2, 1), (2, 2)}
3
{(1, 1), (2, 2)}
4
{(1, 1), (1, 2), (2, 5), (2, 6)}

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