Should profilers have to possess certain credentials in order to work on cases? Why or why not?

Amember of congress who wants to act on what the majority of his or her constituency thinks on a particular issue would be advised to respond to which of the following indicators? a. letters from constituents b. the editorial positions of newspapers in the constituency c. public demonstrations by constituents d. a poll based on a random sample of constituents e. the number of yard signs on major streets