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Given the following multi-step reaction mechanism, which of the following can be classified as an intermediate?
$$O_2 \longrightarrow O + O$$
$$SO_2+ 2O \longrightarrow SO_4$$
$$SO_4+ SO_2 \longrightarrow 2SO_3$$
$O$ is the intermediate.
$SO_4$ is the intermediate.
Both $O$ and $SO_4$ are intermediates.
There are no intermediates in the reaction mechanism.