A uniform ladder in static equilibrium leans against a frictionless wall. The ladder has length L and mass M. Given that the angle between the ladder and floor is 30^o degrees, what would be the value of the coefficient of static friction (µs) between the ladder and the ground?

1) µs ≥ 1/ Ö3

2) µs ≥ 2/ Ö3

3) µs ≥  Ö3 / 2

4) µs ≥  1/ 2