4. For each relation R below, determine whether it is an equivalence relation on the given set A. Also, find the requested relation class (you can do this even if R isn't an equivalence relation). (a) R= {(1,1), (1, 2), (1, 3), (2, 1), (2, 2), (3, 1), (3, 3), (4, 4)} on the set A = {1,2,3, 4}. Find [1]. (b) R={(x,y) E R² | x² = y²} on the set A = R. Find [5]. (c) R= {(x,y) E Z² | xy > 0} on the set A = Z. Find [-7].

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