The sum of rational number $\dfrac{2}{3}$ and its reciprocal is:

1. 1

2. $2\dfrac{1}{6}$

3. 0

4. $\dfrac{5}{6}$

The product of two rational numbers is -1, if one of them is $\dfrac{2}{5}$, then the other is :

1. $-\dfrac{2}{5}$

2. $\dfrac{5}{2}$

3. $-\dfrac{5}{2}$

4. none of these

Assertion (A) : Additive inverse of $\dfrac{2}{5}$ is $-\dfrac{5}{2}$.

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.

Assertion (A) : Multiplicative inverse of $-\dfrac{7}{5} \text{ is } -\dfrac{5}{7}$.

Reason (R) : For every non-zero rational number 'a', there is a rational number $\dfrac{1}{a}$ such that $a \times \dfrac{1}{a} = 1$.

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.