There are two circles C1 and C2 of radii 3 and 8 units, respectively. The common internal tangent, T touches the circles at points P1 and P2, respectively. The line joining the centers of the circles intersects T at X. The distance of X from the center of the smaller circle is 5 units. What is the length of the line segment P1 P2?
1
≤ 13
2
>13 and ≤ 14
3
>14 and ≤ 15
4
>15 and ≤ 16