Letthe following reltion sohemes be grven R(A,B,C) S(D,E,F) let r(R) and s(S) be given. Give an expression in the tuple relational calculus that is equivalent to each of the following a. IIA(r) 2. Let R(A.B,C) and let ri and r both be relations on scheme R. Give an expression in the domain relational calculus that is equivalent to: a. IIA(r)