Which statement correctly defines capacitance for a two-conductor system?

Capacitance is the ratio of the magnitude of charge on one conductor to the potential difference between the conductors, $C=\frac{Q}{V}$

Capacitance is the product of charge and electric field magnitude, $C=QE$

Capacitance is the work done per unit charge in moving charge between conductors

Capacitance is the potential difference per unit charge, $C=\frac{V}{Q}$