Which of the Following Obligations Apply to a Prosecutor in a Criminal

Which of the following obligations apply to a prosecutor in a criminal case?

A) To refrain from prosecuting a charge that the prosecutor knows is not supported by probable cause.
B) To make reasonable efforts to assure an accused person is advised of the right to counsel.
C) To not seek a waiver of an important pretrial right from an unrepresented accused person.
D) All of the above.