Find the value of s such that the given lines intersect and determine their intersection point. The equations of the lines are: L1: x=4t+3, y=10t-2, z=-2t+1 and L2: x=-6s+11, y=as+6, z=6s-5. What is the value of s that satisfies the intersection condition?

A) 4
B) 5
C) 6
D) 7