The correct answer is: D. Round
The Totals row is a special row that appears at the bottom of a table when you select a range of cells. It automatically calculates the sum, average, count, and maximum of the selected cells.
The Round function is not a valid function for the Totals row because it does not calculate a total. It rounds a number to a specified number of decimal places.
The other three functions (Average, Count, and Maximum) are valid functions for the Totals row. They calculate the average, count, and maximum of the selected cells, respectively.