In a rotating frame of reference, two fictitious forces act on a particle:
1. Centrifugal force \( F_c = m\omega^2 r \) acts radially outward.
2. Coriolis force \( F_{cor} = -2m (\vec{\omega} \times \vec{v}) \) acts perpendicular to the velocity and rotation axis.
Since both forces exist in a rotating frame, the correct answer is: