A nurse is preparing to test a client's plantar Babinski reflex. Which of the following Instructions should the nurse give to prepare the client for this test?

"Lie down and I will stroke the bottom of your foot."

"Sit on the edge of the bed while I tap your knee."

"Place your foot in my hand and I will tap the back of your heel."

"Relax your arm across your chest and I will test your elbow extension."