Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to make a simple electrical circuit [title] Gather the necessary materials. [step] To build a simple circuit, you will need a power source, two insulated wires, a light bulb, and a light bulb holder. A power source can be any type of battery or battery pack.

Ending1: To build a simple circuit, you will need to dig a hole in the ground about halfway up a plywood pole. The hole should be big enough to accommodate both the power source and the bulb holder and a wire. Ending2: A clock will count out the voltage of each appliance. [substeps] You will need a voltmeter or some other digital instrument to power the electric meter. Ending3: The rest of the materials can be found at your local hardware store. [substeps] When choosing a light bulb, keep in mind the amount of power your battery emits. Ending4: A power source is a piece of cardboard or colored paper on which to display some images of shapes. You can also make your own obstacles using twine and cloth.

Answer format: ending1/ending2/ending3/ending4