In the Cat's Visual Cortex,bar Detectors

Multiple Choice

In the cat's visual cortex,bar detectors:

A) are general receptors that respond without regard to the width of the bar.
B) are specific to the position of the bar,but respond without regard to orientation.
C) respond positively to light in the center and negatively to light at the periphery,or vice versa.
D) respond only to very specific bar orientations,but without regard to width.