Given: U= { 1,2,3,4,5,6,7,8,9,10,11,12} A = {2, 3, 4, 5} B = {4, 5, 6, 7} C = {6, 7, 8, 9} D = {8, 9, 10, 11},

Find: A ∪ B


a.
{2,3,4,5,6,7,8,9}


b.
{2,3,4,5,6,7}


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