To establish the reliability and credibility of a secondary source, you must know which of the following?

AInformation about the topic of the source, including its historical significance or possible applications it could have to the present day
BInformation about the source itself, including the number of copies it has sold or which countries recognize it as important
CInformation about the history of the time period discussed, including what was going on or which important people were involved
DInformation about the person who created the source, including his education,

A secondary source provides the writer with informantion about primary sources. The person who created the source did so to analyse , interprete and evaluate information coming from sources that have first-hand data. First-hand data are created by a writer who has a straight and direct contact with information- primary sources-. Secondary sources set the focus on someone elses's findings. This is the reason why to get information about the person who created the source is important; this person should be a scholar. If the person is not a scholar, the information from his/her source will not be reliable.