A. p=2, q=-7

B. p=-2, q=7

C. p=-2, q=-7

D. p=2, q=7

For the circles x^{2}+y^{2}+4x+2y-4=0, x^{2}+y^{2}-4x-2y+4=0 the line 3x+4y-5=0 is a

The locus of midpoints of the chord of the circle x^{2}+y^{2} = 25 which pass through a fixed point (4, 6) is a circle. The radius of that circle is

If one end of the diameter of the circle x^{2}+y^{2}-6x+4y-12=0 is (7, -5), then the other end of the diameter is

Polar of the origin w.r.t the circle x^{2}+y^{2}+2ax+2by+c=0 touches the circle x^{2}+y^{2}=r^{2} if

The circle orthogonal to the three circles x^{2}+y^{2}+a_{i}x+b_{i}y+c=0, i=1, 2, 3 is