What is the primary role of the Electronic Payments Association?

The primary role of the Electronic Payments Association, also known as NACHA (National Automated Clearing House Association), is to promote the use of electronic payments in commerce. This organization focuses on fostering the growth and innovation of electronic payment systems, which enhance efficiency and security in financial transactions. By advocating for these payment solutions, the association works to educate stakeholders about the benefits of electronic payments, thereby encouraging their broader adoption in various sectors of the economy.

The other options represent activities that fall outside the primary objectives of the Electronic Payments Association. Regulating tax payments involves specific government financial operations, managing electronic funds transfer transactions is more about operational implementation, and establishing rules for physical cash transactions pertains to traditional cash handling rather than electronic payment processes. The essence of the Electronic Payments Association's mission is encapsulated in promoting electronic payment systems, making that the correct choice.