Rods and cones.
All of the above.
The “wave marked as 2” in the electroretinogram (ERG) above represents the activity of bipolar cells.
Electroretinography (ERG) is an eye test used to detect abnormal function of the retina (the light-detecting portion of the eye). Specifically, in this test, the light-sensitive cells of the eye, the rods and cones, and their connecting ganglion cells in the retina are examined.