Which two sources would be considered credible and useful in supporting the claim identified in the previous question?

Responses
A an article on the rise of cheating from Forbes magazinean article on the rise of cheating from Forbes magazine
B an interview with several principals about cheating incidentsan interview with several principals about cheating incidents
C a story heard in the hall about some kids who were cheatinga story heard in the hall about some kids who were cheating
D a student's blog post on using ipadsa student's blog post on using ipads
E the instruction manual on how to use a cell phone

A and B