Which of the following sentences is accurate? a. PDF stands for "Proofreading Direct Files." b. PDF files cannot be edited. c. Businesses are using PDF files more than ever. d. All businesses use PDF files.

Answer: Option (c) is correct

Explanation:

PDF is portable document format that come in form of file format. It is used for sharing and transmitting between computing and operating systems for viewing and printing in actual page layout. They can be used fro eBooks, scanned document and text etc.

Other options are incorrect because not all business organization use PDF, PDF has the capability of being edited and it stands for "portable document format". Thus, the correct option is option (c)