According to the information in the Excel Basics chapter in the nextbook, which of the following statements is true?

$($a$)$

The AVERAGE function in Excel provides the average number of decimals shown across all cells in an Excel file.

$($b$)$

An Excel file should never be saved until the completion of the analysis.

$($c$)$

Using the filter function will change the order of how the data appears.

$($d$)$

An absolute cell reference is created by using a $ in the cell reference $($for example, $A$$1).$