Sets The set A = { x\ x2 – 7x + 12 =0 } is A.{ 3 , 4 } B. { -3 , 4 } C.{ 3 , -4 } D.{ -3 , -4 } E. None of them 2.The element(s) of A ={ (x,y)\ x+y=8 where x and y are positive integers and x≥ y} is (1,3)