(12 points): Suppose relations R(A B) and S(A C) have n tuples and m tuples, respectively, where n > 0 and m > 0. R.A is a key and S.A is a foreign key to R.A. Find the minimum and maximum numbers of tuples that the following expression can have: a. TARTA S b. TA RUTA S (A R) - C. (A S) d. (A S) - (A R)