Which of the following statements is incorrect with reference to $Ce$ $(Z=58)$?
- AAtomic size of $Ce$ is more than that of $Lu$.
- B$Ce$ shows common oxidation states of $+3$ and $+4$.
- C$Ce^{4+}$ is a reducing agent.
- D$Ce$ in $+3$ oxidation state is more stable than in $+4$.
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