A number of the form $\dfrac{p}{q}$ is said to be a rational number if

1. $p \text{ and } q$ are whole numbers and $q ≠ 0$.

2. $p$ is a whole number and $q$ is a natural number.

3. $p \text{ and } q$ are integers and $q ≠ 0$.

4. $p \text{ and } q$ are integers and $p ≠ 0, q ≠ 0$.

The additive inverse of $\dfrac{-5}{12}$ is

1. $\dfrac{5}{12}$

2. $\dfrac{12}{5}$

3. $\dfrac{-12}{5}$

4. $\dfrac{2}{15}$

The product of additive inverse and multiplicative inverse of $\dfrac{-1}{4}$ is

1. 1

2. -1

3. 0

4. $\dfrac{-1}{16}$

The reciprocal of a negative rational number

1. is a positive rational number

2. is a negative rational number

3. can be either a positive or a negative rational number

4. does not exist