Which of the following experimental procedures would most likely devastate the color vision of the patient?

a. Destruction of approximately 50 million rods and cones in the peripheral region
b. Destruction of approximately 10 million rods and 10 million cones
c. Destruction of approximately 20 million rods at the location where the optic nerve exits the eye
d. Destruction of approximately 20 million cones at the location where the optic nerve exits the eye