The correct answer is:
A. Like the legislature, they have rulemaking authority; like the executive branch, they enforce rules; and like the judiciary, they interpret different regulations.
Independent executive agencies often function in a way that incorporates elements from all three branches of government. They have the authority to create regulations (similar to legislative functions), they enforce compliance with those regulations (similar to executive functions), and they sometimes have the authority to interpret regulations or adjudicate disputes (similar to judicial functions).