CPA firm of Honson & Hansen

You were recently hired by the CPA firm of Honson & Hansen. Within two weeks, you were sent to the first-year staff training course. The instructor asks you to prepare answers for the following questions:
a. How is audit evidence defined?
b. How does audit evidence relate to assertions and to the audit report?
c. What characteristics of evidence should an auditor be concerned with when searching for and evaluating audit evidence?