The pattern of firing of receptor activity in response to red would be
a. large firing from the s receptor, medium firing from the m receptor, and little firing from the l receptor large firing from the s receptor,
b. large firing from the m receptor, and little firing from the l receptor little firing from the s receptor,
c. a moderate firing from the m receptor, and large firing from the l receptor large firing from the s receptor,
d. large firing from the m receptor, and large firing from the l receptor