Consider the following two statements about the magnetic (Lorentz) force on a moving charge: Statement I: The magnetic force experienced by a moving charged particle in a magnetic field is invariant in nature, just like any other force (e.g., gravity or a spring force). Statement II: The magnetic force on a charged particle is given by $\mathbf{F}=q(\mathbf{v}\times\mathbf{B})$, where $\mathbf{v}$ is the velocity of the particle measured with respect to the frame of reference in which $\mathbf{F}$ is being calculated. Which of the following is correct?