Final answer:
The responsibility for oversight and enforcement of the Security Rule transitioned to the Federal Trade Commission (FTC).
Step-by-step explanation:
As of July 27, 2009, the responsibility for oversight and enforcement of the Security Rule transitioned to the Federal Trade Commission (FTC). The FTC is the agency in charge of protecting consumers and ensuring fair competition in the marketplace. They oversee regulations to protect American citizens, including those related to instant communication technology.