If A = {1,3,5,7,9} and B = {2,3,5,7), what is
AUB?
O
{3, 5, 7)
O {
{2, 3, 5, 7, 9)
O {
{2, 3, 5, 7}
O
{1, 2, 3, 5, 7, 9)​