Read the following passage and answer if the question is true or false.
Passage: Many commercial offset printers have accepted the submission of press-ready PDF files as a print source, specifically the PDF/X-1a subset and variations of the same. The submission of press-ready PDF files are a replacement for the problematic need for receiving collected native working files.

Question: does a pdf count as a print source?

Is the answer True or False? Respond with only "True" or "False" and no additional text.
True.