Q1. Which of the following file extensions is applied to an MS PowerPoint 365 presentation by default whenever you save it?
Explanation
A PowerPoint 365 presentation is saved by default with the .pptx extension. This format is the modern Office Open XML presentation format and is meant for slide decks. The .xps format is used for fixed-layout documents, not editable presentations. The .xls extension belongs to older Excel workbooks, so it relates to spreadsheets. The .doc extension belongs to older Word documents, so it is used for text documents rather than PowerPoint presentations.
