From the top of a light house 60 meters high with its base at the sea level, the angle of depression of a boat is 15°. The distance of the boat from the foot of the light house is (in m)

• A. (√3-1)/(√3+1) × 60
• B. (√3+1)/(√3-1) × 60
• C. (√3+1)/(√3-1)
• D. (√3-1)/(√6-1)