The breakdown of ozone \( \left(\mathrm{O}_{3}\right) \) is thought to take place according to the following reaction mechanism:
1. \( \mathrm{O}_{3} \rightarrow \mathrm{O}_{2}+\mathrm{O} \)
2. \( \mathrm{O}_{3}+\mathrm{O} \rightarrow 2 \mathrm{O}_{2} \)
Which of the following formulas could represent the activated complex for step 2 ?
a O
b \( \mathrm{O}_{2} \)
C \( \mathrm{O}_{3} \)
d \( \mathrm{O}_{4} \)