Question: What is another name for smooth rotation?

Is "Simple stepper motor drivers entirely energize or entirely de-energize the field windings, leading the rotor to "cog" to a limited number of positions; more sophisticated drivers can proportionally control the power to the field windings, allowing the rotors to position between the cog points and thereby rotate extremely smoothly." the correct answer?
OPTIONS:
[a]. yes.
[b]. no.
[b].