Which option best describes what must occur for a confession to be admissible following the Miranda decision?

The option stating that all rights must be waived voluntarily is the best description of what must occur for a confession to be admissible following the Miranda decision. This decision established crucial protocols to protect an individual's Fifth Amendment right against self-incrimination during custodial interrogation.

Under Miranda, individuals must be informed of their rights to remain silent and to have an attorney present. For any statements made afterward to be considered admissible, the suspect must knowingly and voluntarily waive these rights. This means they should fully understand their rights and the implications of waiving them without coercion or pressure from law enforcement.

While the presence of an attorney can certainly bolster a suspect's ability to make an informed decision and gives additional assurance that their rights are protected, it is not a strict requirement for the confession to be admissible—provided the waiver of rights was made voluntarily. Reading charges or conducting a physical examination is not mandated for the confession to stand legal scrutiny following the Miranda ruling.