The nurse is assessing the motor function of an unconscious male client. The nurse would plan to use which plan to use which of the following to test the client’s peripheral response to pain

The nurse is assessing the motor function of an unconscious male client. The nurse would plan to use which plan to use which of the following to test the client’s peripheral response to pain?
a. Sternal rub
b. Nail bed pressure
c. Pressure on the orbital rim
d. Squeezing of the sternocleidomastoid muscle.