In the ferret study, what evidence indicated that visual input to the auditory portions of the brain actually produced a visual sensation?

a. Bright flashes of light to the rewired eye caused the ferrets to blink both eyes.

b. Recordings from individual cells of the rewired temporal cortex showed the same patterns usually seen in cells of the occipital cortex.

c. Ferrets could find their way around an unfamiliar room even with the normal eye closed.

d. Ferrets that learned to turn one way in response to light in the normal eye turned the same way to light in the rewired eye.