Which of the following substances are blue? (A) \( \mathrm{Fe}\left(\mathrm{BO}_{2}\right)_{2} \...

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Which of the following substances are blue?
(A) \( \mathrm{Fe}\left(\mathrm{BO}_{2}\right)_{2} \)
(B) \( \mathrm{CoAl}_{2} \mathrm{O}_{4} \)
(C) \( \mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2} \)
(D) \( \mathrm{NaCoPO}_{4} \)
\( P \)
W.
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