Abstract
It is shown that the radiation gauge (Coulomb gauge) of the potentials is the average of DeWitt's line-dependent gauge over all straight lines at constant time converging to the point where the potential is to be calculated. The radiation gauge is then used for demonstrating how the postulate of a complete commuting set of observables, contrary to Aharonov and Bohm's point of view, requires gauge-independent quantum electrodynamics rather than the use of the potentials of the Lorentz gauge.