If $L_1$ represents the radical axis of circles $x^2+y^2-4x-6y+5=0$ and $x^2+y^2-2x-4y-1=0$,and $L_2$ represents the radical axis of $x^2+y^2+2x+2y-7=0$ and $x^2+y^2+x+y+9=0$,then:
- A$L_1$ is parallel to $L_2$.
- B$L_1$ is perpendicular to $L_2$.
- C$L_1$ and $L_2$ intersect at an angle $30^{\circ}$.
- D$L_1$ and $L_2$ intersect at $(1,7)$.
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