Smith and Penn were charged with murder. Each gave a confession to the police that implicated both of them. Smith later retracted her confession, claiming that it was coerced. Smith and Penn were tried together. The prosecutor offered both confessions into evidence. Smith and Penn objected. After a hearing, the trial judge found that both confessions were voluntary and admitted both into evidence. Smith testified at trial. She denied any involvement in the crime and claimed that her confession was false and the result of coercion. Both defendants were convicted. On appeal, Smith contends her conviction should be reversed because of the admission into evidence of Penn's confession. Smith's contention is 
correct, unless Penn testified at trial.  correct, whether or not Penn testified at trial.  incorrect, because Smith testified in her own behalf.  incorrect, because Smith's own confession was properly admitted into evidence. 