If A={1,2}A = \{1, 2\}A={1,2} and B={3,4}B = \{3, 4\}B={3,4}, what is the Cartesian product A×BA \times BA×B?
{(1,3),(1,4),(2,3),(2,4)}\{(1, 3), (1, 4), (2, 3), (2, 4)\}{(1,3),(1,4),(2,3),(2,4)}
{(1,3),(2,4)}\{(1, 3), (2, 4)\}{(1,3),(2,4)}
{1,2,3,4}\{1, 2, 3, 4\}{1,2,3,4}
{(3,1),(4,1),(3,2),(4,2)}\{(3, 1), (4, 1), (3, 2), (4, 2)\}{(3,1),(4,1),(3,2),(4,2)}