If the roots of the equation x^3-12 x...

If the roots of the equation `x^3-12 x^2+39 x-28=0` are in A.P. then common difference will be `+-1` b. `+-2` c.`+-3` d. `+-4`

A

`+-1`

B

`+-2`

C

`+-3`

D

`+-4`.

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