Final answer:
d) optic chiasm. The crossover point for the optic nerve is called the optic chiasm. It is an X-shaped structure located just below the cerebral cortex at the front of the brain.
Step-by-step explanation:
The crossover point for the optic nerve is called the optic chiasm. The optic chiasm is an X-shaped structure located just below the cerebral cortex at the front of the brain. At the optic chiasm, information from the right visual field is sent to the left side of the brain, and information from the left visual field is sent to the right side of the brain.