Which of the following responses occurs as a result of tapping on the patellar tendon?

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[Chapter 2, III C 1; Figure 2.9]. When the patellar tendon is stretched, the quadriceps muscle also stretches. This movement activates Ia afferent fibers of the muscle
spindles, which are arranged in parallel formation in the muscle. These Ia afferent fibers form synapses on $\alpha$-motoneurons in the spinal cord. In turn, the pool of $\alpha$-motoneurons is activated and causes reflex contraction of the quadriceps muscle to return it to its resting length.

Which of the Following Responses Occurs as a Result of Tapping