Which of the following cranial nerve is purely motor in nature

The accessory spinal nerve or XI cranial nerve is a motor nerve, essential for neck and shoulder movement, the intrinsic musculature of the larynx.

The trigeminal nerve is the fifth cranial mixed nerve (CN V) and the largest of the cranial nerves.

The glossopharyngeal nerve is the 9th cranial mixed nerve (CN IX). It is one of the four cranial nerves that has sensory, motor, and parasympathetic functions.

The vestibulocochlear nerve or auditory vestibular nerve, also known as the eighth cranial nerve, it is a sensory nerve