Which of these options would increase the data-ink ratio of this chart? This bar chart shows Satisfaction Score by Group. The groups are numbered 1 through 7 at the x axis, with numbers on the y axis ranging from 0 to 90. The bars are in a light blue and the background is white with a pale grid. The top of each group bar displays the final value as a number. a. Including a subheading below the chart b. Changing the hue of the line c. Adding labels to the axes d. Removing the gridlines