Which of the following reaction(s) is relevant to the microcosmic salt bead test? (a) \( \mathrm...

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Which of the following reaction(s) is relevant to the microcosmic salt bead test?
(a) \( \mathrm{Cr}_{2} \mathrm{O}_{3}+3 \mathrm{~B}_{2} \mathrm{O}_{3} \rightarrow 2 \mathrm{Cr}\left(\mathrm{BO}_{2}\right)_{3} \)
(b) \( \mathrm{CoO}+\mathrm{ZnO} \rightarrow \mathrm{CoZnO}_{2} \)
(c) \( \mathrm{CoO}+\mathrm{NaPO}_{3} \rightarrow \mathrm{NaCoPO}_{4} \)
(d) \( \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}+3 \mathrm{Na}_{2} \mathrm{CO}_{3} \rightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{Na}_{2} \mathrm{SO}_{4}+3 \mathrm{CO}_{2} \)
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