In Oregon V

In Oregon v. Elstad, the Court addressed whether a first confession, given voluntarily before being read his Miranda rights, tainted the second confession by the defendant made after he was placed under arrest and read his Miranda rights. How did the Court answer this question?

A) Reading the suspect his Miranda rights after his arrest cured the taint of the first confession.
B) Once placed under arrest and read his Miranda rights, the officers had a duty to advise the suspect that his first confession was inadmissible.
C) The defendant was precluded from subsequently invoking his Miranda rights once he voluntarily "let the cat out of the bag."
D) Requiring police officers to disregard the second confession would only impede the officers' ability to combat crime and would unnecessarily burden the prosecution.