What standard governs admissibility of a confession obtained during custodial interrogation?

• A. The confession must be voluntary, given without coercion, and properly obtained with rights explained and waived if applicable.
• B. It only needs to be voluntary, not necessarily explained rights.
• C. Does not require waiver of rights if the suspect asks questions.
• D. It can be coerced if police think it's necessary.

Answer: (A)