The elements of Set I are the multiples of 3 and the elements of Set II are the multiples of 6, as shown below.
Set I = {multiples of 3}
Set II = {multiples of 6}
Which of the following sets is the union of Set I and Set II (Set I U Set II) ?
O A. Empty Set
O B. {multiples of 2}
O C. (multiples of 3}
OD. {multiples of 6}
O E. {multiples of 18}