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The lines $p(p^2+1) x-y+q = 0$ and $(p^2 + 1)^2 x + (p^2+1)y + 2q = 0$ are perpendicular to a common line for


( A ) exactly one value of p
( B ) no value of p
( C ) more than two values of p
( D ) exactly two values of p

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