A Portable Document Format (PDF)file Is ________

A portable document format (PDF) file is ________.

A) a type of file that can be opened in most operating systems
B) a type of file that is stored on the cloud and can be accessed via the Internet
C) an outdated file format now superceded by more reliable formats
D) an operating system that can convert numerous types of documents
E) a file format used primarily for images