The correct answer is D) double-pole, double-throw switch. This type of switch is used to connect a single input to either of two outputs, or to disconnect both outputs. It has two separate sets of contacts that can be switched between two different positions, allowing it to control two separate circuits or components. This makes it the appropriate type of switch for the change-over function depicted in the illustration. The other options are incorrect because they do not fully describe the capabilities of the switch shown. A single-pole, single-throw switch only has one set of contacts and can only connect or disconnect a single circuit. A single-pole, double-throw and a double-pole, single-throw switch also do not have the full double-pole, double-throw functionality required for this application.