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

$($a$)$ Using the sort function will hide certain information from the analyst.

$($b$)$ Rows in Excel are labeled alphabetically $($A$,$ B$,$ C$...)$

$($c$)$ An Excel file should never be saved until the completion of the analysis.

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