The horizontal range and the maximum height of a projectile are equal. The angle of projection of the projectile is

\( \theta=\tan ^{-1}\left(\frac{1}{4}\right) \)

\( \theta=\tan ^{-1}(4) \)

\( \theta=\tan ^{-1}(2) \)

\( \theta=45^{\circ} \)