The circle with center A has radius 3 and is tangent to both the positive x- axis and positive y- axis, as shown. Also, the circle with center B has radius 1 and is tangent to both the positive x- axis and the circle with center A. The line L is tangent to both circles. The y- intercept of line L is
Answer Choices
A. 3+6\sqrt3
B. 10+3\sqrt2
C. 8\sqrt3
D. 10+2\sqrt3
E. 9+3\sqrt3