In addition of two binary variables A and B results into

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In addition of two binary variables A and B results into a SUM and a CARRY output. Consider the following expressions for the SUM and CARRY outputs.
(1) SUM = A. B + A·B
(2) SUM = A.B + B.A
(3) CARRY = A. B
(4) CARRY = A + B
Which of the following expressions are correct?

1. 1 and 2
2. 2 and 3
3. 2 and 4
4. 1 and 4

Correct Option: B

NA