What are procedures which create a blind photo identification? (Select all that apply.)

having the arresting officer remain silent throughout identification procedure
having the arresting officer remain silent throughout identification procedure , ,

affirming under oath that officer administering identification did not influence it unfairly
affirming under oath that officer administering identification did not influence it unfairly , ,

bringing in officers or agents who are unfamiliar with the case
bringing in officers or agents who are unfamiliar with the case , ,

placing photos in folders and mixing them up so witness can see the photos but officer cannot