Which of the following are an amphoteric oxide? \[ \mathrm{Mn}_{2} \mathrm{O}_{7}, \mathrm{CrO}_...

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Which of the following are an amphoteric oxide?
\[
\mathrm{Mn}_{2} \mathrm{O}_{7}, \mathrm{CrO}_{3}, \mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{CrO}, \mathrm{V}_{2} \mathrm{O}_{5}, \mathrm{~V}_{2} \mathrm{O}_{4}
\]
(a) \( \mathrm{V}_{2} \mathrm{O}_{5}, \mathrm{Cr}_{2} \mathrm{O}_{3} \)
(b) \( \mathrm{Mn}_{2} \mathrm{O}_{7}, \mathrm{CrO}_{3} \)
(c) \( \mathrm{CrO}, \mathrm{V}_{2} \mathrm{O}_{5} \)
(d) \( \mathrm{V}_{2} \mathrm{O}_{5}, \mathrm{~V}_{2} \mathrm{O}_{4} \)
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