Composition of complex formed when the ore argentite is treated with NaCN is

• A

  $\mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN}{)}_2\right]$

• B

  ${\mathrm{Na}}_3\left[\mathrm{Ag}(\mathrm{CN}{)}_6\right]$

• C

  $\mathrm{Na}\left[\mathrm{Au}(\mathrm{CN}{)}_2\right]$

• D

  $\mathrm{Na}\left[\mathrm{Au}(\mathrm{CN}{)}_6\right]$