Which of the following is an example of an agency without both quasi-legislative and quasi-judicial power?

The U.S. Postal Service serves as an example of an agency that operates without both quasi-legislative and quasi-judicial powers. Its primary function is to provide postal services and manage mail delivery, which involves operational decisions rather than creating or adjudicating laws.

In contrast, other listed agencies, such as the Federal Trade Commission, the Environmental Protection Agency, and the Securities and Exchange Commission, engage in rule-making (quasi-legislative power) that allows them to create regulations within their respective fields and have the ability to adjudicate disputes (quasi-judicial power) regarding compliance with those regulations. The Postal Service, however, does not have these additional powers that enable it to legislate or adjudicate, thereby distinguishing it in this context.