You Are the On-Duty Desk Sergeant at the Local Police

You are the on-duty desk sergeant at the local police station. A man walks in and says, "I killed someone and want to confess." You grab your digital voice recorder and direct the man to a chair. He sits down and tells the tale of what turns out to be a first-degree murder. You record every word, including the numerous instances in which you said, "Uh- huh" and "I see." Satisfied that the subject did, indeed, commit a murder, you place him under arrest. The confession is:

A) inadmissible, because recording it was a violation of the man's reasonable expectation of privacy.
B) inadmissible, because the man was in a coercive environment and was, therefore, in custody for purposes of Miranda, and the encouragement to continue was interrogation.
C) admissible under the public safety exception to Miranda, because the man was a danger to police officers and the public.
D) admissible as a voluntary statement, because the subject was neither in custody nor interrogated for purposes of Miranda.