5. Draw the direct graph for the relation R defined on the set A = {a, b, c, d). Then state whether the relation R is an equivalence relation. If so, list the distinct equivalence classes. If not, state the properties that fail. R = ((a,a), (a, c), (a, d), (b,b), (c,a), (c, c), (c, d), (d,a), (d, c), (d, d)}