In classical electrodynamics, electromagnetic forces arise from movement of charge or a time-varying magnetic field. Electrostatic forces arise between fixed charges, and generally don't involve a magnetic field (unless the observer is moving relative to the fixed charges).
However, the question is asking about quantum electrodynamics (virtual photons) where by definition everything is "dynamic", even the forces between static particles. I think the wording is rather confusing, because they are mixing the classical notion of "electrostatic" force with its explanation in quantum electrodynamics which is necessarily dynamic in nature.
In short, don't worry about it, the question is badly worded.