A particle `p` moves from the point `A(0,4)` to the point `10 ,-4)` . The particle `P` can travel the upper-half plane `{(x , y)|ygeq}` at the speed of `1m//s` and the lower-half plane `{(x , y)|ylt=0}` at the speed of 2 m/s. The coordinates of a point on the x-axis, if the sum of the squares of the travel times of the upper- and lower-half planes is minimum, are (a) (1, 0) (b) (2, 0) (c) (4, 0) (d) (5, 0)