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Given these standard reduction potentials, what is the standard reduction potential for \( \mathrm{Co}^{3+}(\mathrm{aq})+3 \mathrm{e}^{-} \rightarrow \mathrm{Co}(\mathrm{s}) \) ?
\[
\begin{array}{l}
\mathrm{Co}^{3+}(\mathrm{aq})+\mathrm{e}^{-} \rightarrow \mathrm{Co}^{2+}(\mathrm{aq}) ; \mathrm{E}^{\mathrm{o}}=1.82 \mathrm{~V} \\
\mathrm{Co}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Co}(\mathrm{s}) ; \mathrm{E}^{\mathrm{o}}=-0.28 \mathrm{~V}
\end{array}
\]
(a) \( 2.10 \mathrm{~V} \)
(b) \( 1.54 \mathrm{~V} \)
(c) \( 1.26 \mathrm{~V} \)
(d) \( 0.42 \mathrm{~V} \)
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