Chlorine atoms present in the upper atmosphere bring about the breakdown of ozone. $\text{Cl} + \text{O}_3 \rightarrow \text{O}_2 + \text{ClO}$ $\text{ClO} + \text{O} \rightarrow \text{Cl} + \text{O}_2$ Which of the following statements about these chlorine atoms are correct?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct