Which of the Following Is/are Correct About Constituent and Interest

Which of the following is/are correct about constituent and interest group feedback?

A) The feedback loop between the private and governmental actors is one way
B) Governmental actors only learn of the need for policy modification through their own analysis
C) The iron triangle relationship is important in developing and implementing policy modifications
D) All feedback from constituents requires legislative action
E) Government actors only learn of the need for policy modification through the analytical and evaluative efforts of constituent or interest groups