In which of the following solutions, the solubility of $\mathrm{AgCN}$ will be greater than in pure water ? $(p{k}_w=14)$

In $N{H}_3$ solutions buffer of $pH=5,$ the solubility of $AgCN$ will increases due to complex formation in case of $N{H}_3$ solution and hydrolysis $C{N}^{\oplus }$ ions in case of buffer of  $pH=5$
In case of buffer of  $pH=12,pOH=2,\left[\stackrel{\oplus }{O}H\right]={10}^{-2},$ No common ion, so no effect on the solubility of  $AgCN$
In $AgN{O}_3$ solution, the solubility of $AgCN$ will decrease as compared to pure water because of common ion effect    $A{g}^{+}ion$