Two paper pulp plants $P$ and $Q$ use the same quality of bamboo as a raw material. The chemicals used in their digester are as follows:

$$\begin{array}{clcIcI|cI|cI|c}\hline &\textbf{} & \textbf{Plant P} & \textbf{Plant Q} \\ \hline &\text{NaOH} & \text{Yes} & \text{No} \\ &\text{Na_{2}S} & \text{Yes} & \text{No} \\ &\text{Na_{2}CO_{3}} &\text{Yes} &\text{Yes}\\ &\text{NaHCO_{3}} &\text{No} &\text{Yes}\\ &\text{Na_{2}SO_{3}} &\text{No} &\text{Yes}\\ \hline \end{array}$$

Which one of the following statements is $CORRECT$ ?

1. Plant $P$ and Plant $Q$ both use the Sulfite process
2. Plant $P$ and Plant $Q$ both use the Kraft process
3. Plant $P$  uses Sulfite process
4. Plant $P$  uses Kraft process