The nurse is testing the cranial nerves of a patient diagnosed with myasthenia gravis. The nurse asks the patient to clench his jaw while she palpates the temporal and masseter muscles. The nurse is...

The nurse is testing the cranial nerves of a patient diagnosed with myasthenia gravis. The nurse asks the patient to clench his jaw while she palpates the temporal and masseter muscles. The nurse is correctly testing which cranial nerve?

a. Abducens

b. Trigeminal