Question
$Na^+$, $Mg^{2+}$, $Al^{3+}$, $Si^{4+}$ are isoelectronics. Their ionic size follows the order
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$(A)\,\,\,\,[Ni(H_2O)_5NH_3]^{2+},$
$(B)\,\,\,\,[Ni(H_2O)_4(NH_3)_2]^{2+}$ and
$(C)\,\,\,\,[Ni(H_2O)_3(NH_3)_3]^{2+}$ is

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