Which common color usage mistake is illustrated in this chart? A heat map is titled ?Monthly Mean Daily Low Temperature for Indianapolis.? The heat map shows a 12-by-10 grid with colored cells. The columns are labeled with the names of the months from January to December. The rows are labeled with years from 2010 at the top to 2019 at the bottom. The months of December, January, and February are in different shades of green, the months of March and November are in light shades of red and green, and the month from April through October are in different shades of red. The intensity of the redness increases from April through July and then decreases through October. a. Insufficient contrast b. Neglecting colorblindness c. Excessive color d. Unnecessary color