The relation amongst the three elements of Earth's magnetic field, namely horizontal component $H$, vertical component $V$ and dip angle $\delta$ is ($B_E$ = total magnetic field):

1. A
   $V=B_E\tan \delta$, $H=B_E$
2. B
   $V=B_E\sin \delta$, $H=B_E\cos \delta$
3. C
   $V=B_E\cos \delta$, $H=B_E\sin \delta$
4. D
   $V=B_E$, $H=B_E\tan \delta$