Primary sources

interpret and analyze other primary sources
analyze computer and internet sources
provide firsthand testimony or direct evidence
can only be found in public and university libraries

The best and most correct answer among the choices provided by the question is the third choice "provide firsthand testimony or direct evidence"
A primary source provides direct or firsthand evidence about an event, object, person, or work of art. Primary sources include historical and legal documents, eyewitness accounts, results of experiments, statistical data, pieces of creative writing, audio and video recordings, speeches, and art objects.

I hope my answer has come to your help. God bless and have a nice day ahead!