(c) (Graded for fair effort completeness) A shade of gray is one where the red component, green component, and blue component all have the same color. To convert a color to grayscale, we can average its three component values and use this average as the grayscaled color's red component, green component, and blue component. Fill in the blanks in the following definition of the function grayscale by specifying its domain, codomain, and the rule for application. Challenge: your expression for the rule may use only n, constant integers, and the operations + (addition), (subtraction), (multiplication), div (integer division), and mod (remainder). (You may not need to use all these operations.) grayscale : where, for each c E grayscale(c) =