When adjusting the HSL in Excel, the slider identified on the right side of this screenshot controls

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Question:

When adjusting the HSL in Excel, the slider identified on the right side of this screenshot controls the __________. The image is a screenshot of Excel's HSL color adjusting. The slider referred to is on the right side. The top of the slider is white and then fades to darker hues as the slider goes down. a. None of these choices are correct. b. hue c. saturation d. luminance