How many locations can four-way switches operate from?

Four-way switches are designed to be used in conjunction with at least two three-way switches to control a single light or set of lights from multiple locations. Specifically, four-way switches can allow for control from three or more locations.

In a typical setup, you would have one three-way switch at the beginning of the circuit and another three-way switch at the end, with one or more four-way switches installed in between. Each additional four-way switch increases the ability to control the lighting from another location.

Thus, if you have three or more switches involved in controlling the light, the four-way switches facilitate that control, allowing operation from multiple points. The correct choice reflects this capability, establishing that four-way switches can effectively operate from four locations when integrated into a circuit with the appropriate three-way switches.