Final answer:
The United States Postal Service (USPS) is an independent agency of the Executive Branch, set up as a government corporation to operate independently from executive departments and the Executive Office of the President. It reports directly to Congress for oversight and funding.
Step-by-step explanation:
The United States Postal Service (USPS) is an independent agency of the Executive Branch. This categorization is because it operates independently and is not part of any executive department or the Executive Office of the President. Originally part of the Cabinet as the Post Office Department, it was reorganized as an independent entity in the early 1970s. Unlike cabinet departments that are directly accountable to the president and include organizations like the Departments of State and Defense, the USPS is structured as a government corporation designed to run more like a private business and reports directly to Congress for oversight and funding.
Independent agencies are created for more focused tasks and are not subject to the regulatory authority of any specific department, whereas regulatory agencies like the Environmental Protection Agency (EPA) or the Federal Communications Commission (FCC) are tasked with implementing and enforcing specific congressional laws. Therefore, when considering the available choices, the most accurate answer is that the United States Postal Service is an example of an independent agency of the Executive Branch, making option 'd' the correct answer.