Assertion: The anions $\mathrm{ClO}{}^{-}$, $\mathrm{ClO}{}_2{}^{-}$, $\mathrm{ClO}{}_3{}^{-}$ and $\mathrm{ClO}{}_4{}^{-}$ are named hypochlorite, chlorite, chlorate and perchlorate. Reason: The suffix -ite always indicates an oxidation number of $+3$ and the suffix -ate always $+5$ for the central atom, whatever the element.

1. ABoth the Assertion and the Reason are true, and the Reason is the correct explanation of the Assertion
2. BBoth the Assertion and the Reason are true, but the Reason is not the correct explanation of the Assertion
3. CThe Assertion is true but the Reason is false
4. DThe Assertion is false but the Reason is true