The correct sequence of layers of neurons in the retina, from anterior to posterior in the eye, is ______.
a. bipolar neurons $\rightarrow$ ganglionic neurons $\rightarrow$ rods and cones $\rightarrow$ back of eye
b. rods and cones $\rightarrow$ bipolar neurons $\rightarrow$ ganglionic neurons $\rightarrow$ back of eye
c. ganglionic neurons $\rightarrow$ rods and cones $\rightarrow$ bipolar neurons $\rightarrow$ back of eye
d. ganglionic neurons $\rightarrow$ bipolar neurons $\rightarrow$ rods and cones $\rightarrow$ back of eye