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4.Which among the following are secondary source of information?

A.historical documents,birth certificates,autobiographies and maps
B.research article,clinical reports,case studies and dissertations
C.musical compositions, photographs video and other forms of artistic expression
D.magazine, newspaper articles, Essay or review

5.which among the following is not a tertiary source of information?

A.index B.book review c.abstract
d.database

6.Which among the following is not a secondary source of information

A.magazine b. novels c. essay d. journal articles​