run on a direct current. are connected in series. are connected in parallel. run on an alternating current.
I gave my students this multiple choice question: Four significantly different household appliances (blender, mixer, toaster, and food processor) are plugged into four outlets along a counter. Turning on or off one or more of the appliances does not affect the performance of the other appliances because the four appliances

Only one answer is correct among these 4 choices:
- run on a direct current.
- are connected in series.
- are connected in parallel.
- run on an alternating current.

Could you tell me which one is correct?

are connected in parallel.