Which has peroxy linkage?

Peroxy linkage is the coupling of two oxygen atoms, also known as oxygen-oxygen links, and molecules with such linkages are known as peroxy compounds. Among the given acids, none has a peroxy linkage. Perchloric acid $\left({\mathrm{HClO}}_4\right)$, Hypochlorous acid $\left(\mathrm{HOCl}\right)$, and $\mathrm{Chloric}$ acid $\left({\mathrm{HClO}}_3\right)$ do not have a peroxy linkage.