Quadratic

If every pair from among the equations $ x^2+px+qr=0 $ , $ x^2+qx+rp=0 $and $ x^2+rx+pq=0 $ has a common root, then the product of three common root is
a)pqr b)2pqr c)$ p^2q^2r^2 $ d)none of these

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