The correct answer is: A. credit unions
A credit union is a member-owned financial cooperative, democratically controlled by its members. Credit unions are not-for-profit organizations that offer a variety of financial services, including checking and savings accounts, loans, and credit cards. They are designed to provide affordable financial services to people who might not otherwise have access to them, such as low-income individuals and families.
Credit unions are regulated by the National Credit Union Administration (NCUA), an independent federal agency. The NCUA ensures that credit unions are safe and sound, and that they provide their members with fair and competitive financial services.
Debit unions, preferred unions, and solving unions are not real types of unions.