Let PQ and MN be two straight lines touching the circle $$x^{2}+y^{2}-4x-6y-3=0$$ at the points A and B respectively. Let O be the centre of the circle and $$\angle AOB=\pi/3$$. Then the locus of the point of intersection of the lines PQ and MN is:

A

$$3(x^{2}+y^{2})-12x-18y-25=0$$

B

$$x^{2}+y^{2}-18x-12y-25=0$$

C

$$3(x^{2}+y^{2})-18x-12y+25=0$$

D

$$x^{2}+y^{2}-12x-18y-25=0$$