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Let A = {1, 2, 3}, B = {2, 3, 4}, then w...

Let A = {1, 2, 3}, B = {2, 3, 4}, then which of the following is a function from A and B?
(a) {(1,2), (1,3), (2,3), (3,3)}
(b) {(1,3), (2,4)}
(c) {(1,3), (2,2), (3,3)}
(d) {(1,2), (2,3), (3,2), (3,4)}

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