Which of the following is an example of an action that might be taken by a regulatory agency? setting standards for the stock exchange and enforcing those standards creating the nation’s money creating medicare and medicaid acting as a liaison between the us and other nations

setting standards for the stock exchange and enforcing those standards

Regulatory action is basically the rules and regulations aimed at ensuring the fair operation of the regulated activity. In the stock exchange, this can include standards to ensure that investors are not defrauded  

setting standards for the stock exchange and enforcing those standards