What is the extension of a PowerPoint presentation file

What is the extension of a PowerPoint presentation file
Past Papers: Labour & Human Resource Department — Past Paper MCQs PPSC Past Paper MCQs (2005–2025)
A: .pp
B: .xls
C: .ppt
D: None of these

Classic PowerPoint files use .ppt and modern versions use .pptx. The key marks None of these likely due to version focus. Remember that .xls belongs to Excel. If the exam expects the newer format then .pptx is correct. Always read the course notes for the preferred extension in that syllabus.