The definition of a club says that members derive benefits from either sharing costs, association with one another, or from consuming a congestible public good. For each of the following groups specify which of these three benefits is likely to be the dominant factor that encourages membership:
a. Blockbuster video club
b. Iowa Pork Producers Association
c. Unofficial Studebaker Drivers Club
d. Second Wives Club
e. Moral Majority
f. American Civil Liberties Union (ACLU)