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If the difference of the roots of the question `,x^(2)+px+q=0"be unity, then"(p^(2)+4q^(2))` equals to :

A

`(1+2q)^(2)`

B

`(1-2q)^(2)`

C

`(p-q)^(2)`

D

`2(p-q)^(2)`

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