Passage Question(Q1-Q2): I. Roberts can be convicted on the basis of Edwards testimony against him. II. Edwards’ testimony would show that Edwards himself participated in Roberts’ wrongdoing. III. The crime for which Roberts is accused can only be committed by a person acting alone. IV. If the jury learns that Edwards himself committed some wrong, they will refuse to believe any part of his testimony. (Q2). If all four propositions are taken as a group, it can be pointed out that the scenario they describe is