The Code permits all bathroom receptacles to be on which type of branch circuit as long as they don't supply other loads?

The appropriate branch circuit for bathroom receptacles, according to the National Electrical Code (NEC), is the 20-ampere circuit. This is because bathroom receptacles require a higher amperage capacity due to the potential for devices like hair dryers, curling irons, and other equipment that can draw significant current.

A 20-ampere circuit provides adequate capacity to handle the load of multiple devices without the risk of tripping the circuit breaker. Additionally, having bathroom receptacles on a dedicated 20-amp circuit ensures that these outlets can safely serve the demands of users without being affected by other household devices that may be on the same circuit. This contributes to overall safety in the bathroom, an area prone to moisture where extra caution is necessary.

The other amperage options, while they could theoretically work for lighter loads, do not meet the NEC's requirements for the safety and functionality expected in bathroom wiring.