Which of the following is true?
1) Grand juries were established in Common Law as a clear asset to the monarchy.
2) Witnesses in front of grand juries must testify, if given transactional immunity.
3) Grand juries serve to indict, not to investigate.
4) Witnesses when testifying have the right to have counsel present in the grand jury room.
5) Grand juries were incorporated in the case Benton v. Maryland (1968).