Which of the following is true of political endorsements by interest groups?

a$.$ They are important because the group can publicize its choices in its membership publications.

b$.$ They are relatively ineffective today.

c$.$ They are not very important because candidates cannot publicize the fact that they have been endorsed by specific groups.

d$.$ They are a violation of campaign finance reform laws.

e$.$ They are allowed in local elections but forbidden in races for federal office.