What Did the Court Decide with Regards to Show-Ups Where

What did the court decide with regards to show-ups where the police typically bring one person by for the victim or witness to identify?

A) Since the process is highly suggestive and widely condemned,it violates due process and therefore cannot be used.
B) The police can no longer use show-ups unless they have at least two or more suspects.
C) The police can only use a show-up if the suspect consents.
D) This process is highly suggestive and widely condemned,but it does not deny due process and is therefore permitted.