Final answer:
The optic nerve (CN II) is a sensory cranial nerve, solely responsible for transmitting visual information from the eyes to the brain. Unlike the facial nerve (CN VII), which has both sensory and motor functions along with preganglionic parasympathetic fibers, the optic nerve does not have motor functions or carry parasympathetic fibers.
Step-by-step explanation:
The optic nerve (CN II) is classified as a sensory cranial nerve. It is responsible for conveying visual information from the eye to the brain. This nerve is dedicated solely to carrying sensory input, and it does not carry motor fibers or have any motor function. The optic nerve is vital for visual sensation, allowing for the perception of light and images. Among the twelve cranial nerves, some are purely sensory like the optic nerve, while others are motor or a combination of both.
The facial nerve (CN VII), on the other hand, contains preganglionic parasympathetic fibers. This nerve has both sensory and motor functions; it controls muscles for facial expressions and conveys taste sensations, and also carries parasympathetic fibers that influence saliva production and other functions.