Let A = {1, 2, 3, 4}, B = {1, 5, 9, 11, 15, 16} and f = {(1, 5), (2, 9), (3, 1), (4, 5), (2, 11)}. Are the following true? \[\] (i) f is a relation from A to B (ii) f is a function from A to B. \[\] Justify your answer in each case.

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