The oxidation number of the underlined atom in the following species is given. Identify the incorrect option.
- A$HAuCl_4$ is $+3$
- B$Cu_2\underline{O}$ is $-1$
- C$\underline{Cl}O_3^{-}$ is $+5$
- D$K_2\underline{Cr_2O_7}$ is $+6$
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