The figure shows four directions for the velocity vector \( \vec{v}...

The figure shows four directions for the velocity vector \( \vec{v} \) of a positively charged particle moving through a uniform electric field \( \vec{E} \) and a uniform magnetic field \( \vec{B} \). Of all four directions, which results in a net force of zero?
(a) 4
(b) 3
(c) 1
(d) 2