Q 2761567425.     At what ` [Br^-]/sqrt([CO_3^(2-)])` does the following cell have its reaction at equilibrium?
`Ag (s) | Ag_2 CO_3 (s) | Na_2 CO_3 (aq) || KBr(aq) | AgBr(s) | Ag(s)`
`K_(SP) = 8 xx 10^(-12)` for `Ag_2 CO_3` and `K_(SP) = 4 xx 10^(-13)` for `AgBr`

A

`sqrt1 xx 10^(-7)`

B

`sqrt2 xx 10^(-7)`

C

`sqrt3 xx 10^(-7)`

D

`sqrt4 xx 10^(-7)`

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