In a vertical plane `p_(1)` making angle `30^(@)` with magnetic meridian , apparent angle of dip is `60^(@)` . The apparent angle of dip in vertical plane `p_(2)` , which is perpendicular to plane `p_(1)` is
A. `30^(@)`
B. `45^(@)`
C. `tan^(-1)(3)`
D. `tan^(-1)((1)/(3))`