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The Boolean function realized by the logic circuit shown is

1. $F = \sum_{m} (0, 1, 3, 5, 9, 10, 14)$
2. $F=\sum_{m}(2,3,5,7,8,12,13)$
3. $F=\sum_{m}(1,2,4,5,11, 14,15)$
4. $F= \sum_{m}(2,3,5,7,8,9,12)$