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The answer to questions is a single digit integer, ranging from 0 to 9 . If the correct answers to the question numbers \( A, B, C \) and \( D \) (say) are \( 4,0,9 \) and 2 respectively, then the correct darkening of bubbles should be as shown on the side :
How many of the following hydroxides is/are amphoteric in character? \( \mathrm{CsOH}, \mathrm{LiOH}, \mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{Be}(\mathrm{OH})_{2}, \mathrm{Mg}\left(\mathrm{OH}_{2}\right), \mathrm{Ba}(\mathrm{OH})_{2}, \mathrm{Sr}(\mathrm{OH})_{2}, \mathrm{Ba}(\mathrm{OH})_{2}, \mathrm{KOH} \), \( \mathrm{NaOH} \).
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