2. Suppose relation R(A,B,C) has the tuples: wwwwa Using bag projection and difference, compute TA.B(R) - Ps(A,B)(TB,C(R)). Note that the renaming is only to give the two projections the same schema. Which of the following is true about the tuples that appear in the result? a) (1,2) appears once in the result. b) (2,2) does not appear in the result. o c) (2,3) appears - 1 times in the result. d) (3,1) appears once in the result