Please choose the correct answer to the question: Mr. Jenkins constructed a circuit consisting of a variable source, wires, and a resistor. In order to triple the amount of current, how should he change the voltage of the source?

Answer1: make the voltage three times larger Answer2: make the voltage one-third as great Answer3: make the voltage nine times larger Answer4: make the voltage one-ninth as great

Answer format: answer1/answer2/answer3/answer4