Identifying Rational Numbers

Consider the following numbers:

1. $\sqrt{8}$

2. $\f\frac{1}{3}$

3. $\pi$

4. $2.6$

5. $\sqrt{9}$

Which of these numbers are classified as rational numbers? A rational number is any number that can be expressed as the quotient of two integers (i.e., $\f\frac{a}{b}$, where $b \neq 0$).