write in set builder notation
4) (9, 12, 15, 18, ..., 39) 8-203 A) {x|x is a multiple of 3) C) (x | x is a multiple of 3 between 6 and 42} D) 17, 18, 19, 201 B) (x x is a multiple of 3 greater than 9} D) (x | x is a multiple of 3 between 9 and 39}​