Give a relation r from A = {5, 6, 7} to B = {3, 4, 5} such that
(a) r is not a function.
(b) r is a function, but not a function from A to B.
(c) r is a function from A to B, with Rng( r) = B.
(d) r is a function from A to B, with Rng( r) ≠ B.
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