Assertion (A) : Additive inverse of is . Reason (R) : For every non-zero rational number 'a', '-a' such that a + (-a) = 0. 1. Both A and R are correct, and R is the correct explanation for A. 2. Both A and R are correct, and R is not the correct explanation for A. 3. A is true, but R is false. 4. A is false, but R is true.