What is the default file extension for an Excel 2016 workbook?

The default file extension for an Excel 2016 workbook is .xlsx. This extension signifies that the file is an XML-based Excel workbook, a format introduced with Excel 2007 to offer improved file recovery, smaller file sizes, and enhanced security compared to older versions. Understanding file extensions is crucial for identifying file types and ensuring compatibility.

• .docx (A) is incorrect; this is the default file extension for Microsoft Word documents.
• .pptx (B) is incorrect; this is the default file extension for Microsoft PowerPoint presentations.
• .xls (D) is incorrect; this was the default file extension for older Excel versions (Excel 97-2003) and represents a binary file format.