OCR Computing Question
This looks like an advertisement for Microsoft...

The intention was that while DOCX can be created using the rather expensive but commonly available Microsoft Word, PDF is created by Adobe Acrobat (not the free Reader!) which is not commonly available. However, there are many other ways to create PDFs, and nowadays you can print to PDF even on Windows, which is roughly as commonly available as Microsoft Word.

In conclusion, it's an oversight by the question setters, who appear to be parroting material which has been influenced by Microsoft for obvious commercial purposes.