All of the following are true regarding the nih public access policy except: a) the policy requires authors of articles written about federally funded research (e. g., the nih, the cdc, etc.) to deposit the final version of their manuscript accepted to publication into pubmed central. b) allows everyone access to the results of federally funded research by using pubmed central c) requires authors of federally funded research to pay an extra charge to deposit their manuscripts into pubmed central d) makes approximately 20% of the biomedical literature freely available to anyone on the internet