Two circles S(1)= px^(2) + py^(2) + 2g'x...

Two circles `S_(1)= px^(2) + py^(2) + 2g'x + 2f'y + d= 0 and S_(2) = x^(2) + y^(2) + 2gx + 2fy + d'= 0` have a common chord PQ. The equation of PQ is

A

`S_(1) - S_(2)= 0`

B

`S_(1) + S_(2)= 0`

C

`S_(1) - pS_(2)= 0`

D

`S_(1) + pS_(2)= 0`

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