Which statement best describes a switching electronic voltage regulator?

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A switching electronic voltage regulator controls the output by rapidly turning a switch on and off and adjusting how long it stays on (the duty cycle) in response to line and load conditions. When the switch is on, energy is delivered to an energy-storage element (like an inductor) and then released to the output when the switch is off, with the average output voltage set by the duty cycle. This PWM approach lets the regulator maintain the desired output efficiently, even as input or load changes.

That description matches a regulator whose control device is switched on and off with a duty cycle that responds to line and load conditions. The other statements describe behaviors that aren’t central to how a switching regulator regulates voltage—such as producing a ramped output, varying a control element’s conduction in a way more typical of linear regulation, or simply providing multiple outputs.