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Which two sets of reactants best represent the amphoteric character of \( \mathrm{Zn}(\mathrm{OH})_{2} \) ?
P Set \( 1: \mathrm{Zn}(\mathrm{OH})_{2}(s) \) and \( \mathrm{OH}^{-}(a q) \)

W
Set \( 2: \mathrm{Zn}(\mathrm{OH})_{2}(s) \) and \( \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \)
Set \( 3: \mathrm{Zn}(\mathrm{OH})_{2}(s) \) and \( \mathrm{H}^{+}(a q) \)
Set \( 4: \mathrm{Zn}(\mathrm{OH})_{2}(s) \) and \( \mathrm{NH}_{3}(a q) \)
(a) 1 and 2
(b) 1 and 3
(c) 2 and 4
(d) 3 and 4
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