The correct answer is: C. Column letters and row numbers
Excel uniquely identifies cells within a worksheet with a cell locator coordinate, which is a combination of a column letter and a row number. For example, the cell in the first column and first row is A1, the cell in the second column and first row is B1, and so on.
A cell name is a user-defined name for a cell or range of cells. Cell names can be used to make formulas easier to read and understand, and they can also be used to refer to cells in other worksheets and workbooks.
Column numbers are the numbers that appear to the left of the cells in a worksheet. The first column is column A, the second column is column B, and so on.
Row letters are the letters that appear above the cells in a worksheet. The first row is row 1, the second row is row 2, and so on.
I hope this helps! Let me know if you have any other questions.