Three Faradays of electricity are passed through aqueous solutions of $$\mathrm{AgNO_3}$$, $$\mathrm{NiSO_4}$$ and $$\mathrm{CrCl_3}$$ in three vessels using inert electrodes. The ratio in moles in which Ag, Ni and Cr are deposited is

A

$$1\colon2\colon3$$

B

$$3\colon2\colon1$$

C

$$6\colon3\colon2$$

D

$$2\colon3\colon6$$