Which of the Following Is the Best Description of Grey

Multiple Choice

Which of the following is the best description of grey literature?

A) Papers, reports, and other documents from private industry that often may be biased because of private funding.
B) Papers, reports, and other documents referred to as grey because of the weak evaluation of their accuracy and usefulness.
C) Papers, reports, and other documents controlled by commercial publishers that have passed the highest levels of review and academic scrutiny.
D) Papers, reports, and other documents from government, the academy, business, and industry that are not controlled by commercial publishers but are a valid form of evidence.