When borax is heated with \( \mathrm{CoO} \) on a platinum loop, blue coloured bead formed is la...

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When borax is heated with \( \mathrm{CoO} \) on a platinum loop, blue coloured bead formed is largely due to:
(a) \( \mathrm{B}_{2} \mathrm{O}_{3} \)
(b) \( \mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2} \)
(c) \( \mathrm{CoB}_{4} \mathrm{O}_{7} \)
(d) \( \mathrm{CO}\left[\mathrm{B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \)
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