Which of the Following Statements Is True About Miranda Warnings

Which of the following statements is true about Miranda warnings?

A) Because of Miranda,an individual can invoke the privilege against self-incrimination by remaining silent.
B) In questioning a defendant,the police may purposefully question first and warn later.
C) A statement made by a defendant in custody is admissible only if the defendant was informed prior to police interrogation of his or her constitutional rights.
D) The privilege against self-incrimination extends to investigations by all self-regulatory organizations.