When Testing Reflexes,you Should Hold the Reflex Hammer

When testing reflexes,you should hold the reflex hammer

A) loosely between the thumb and index finger, striking the tendon with a brisk wrist motion.
B) securely in your hand, striking the tendon slowly and firmly.
C) tightly with all your fingers, striking the tendon with a quick wrist motion.
D) firmly between the thumb and index finger, striking the tendon with a light tap.