Which of the Following Statements Is True About References

Which of the following statements is true about references?

A) The most frequently contacted references are coworkers.
B) Permission is never required while using a particular person as a reference because this creates a bias.
C) Similar references should be chosen, such as three professors or three coworkers.
D) Contacting references is a good way to validate information supplied on the application form.
E) All of the above statements about references are true.