Final answer:
Congress can control the federal bureaucracy by reducing their budget, rejecting presidential appointees for cabinet positions, abolishing federal programs, and investigating agency activities; thus, the correct answer is 'All of the above'.
Step-by-step explanation:
Congress can control the federal bureaucracy through various methods. These include reducing their budget, which impacts the agencies' ability to carry out programs; turning down a presidential appointee to a cabinet secretary's position, affecting the leadership and direction of an agency; abolishing a federal program, directly impacting the machinery of the bureaucracy; and investigating their activities, which could lead to changes, reforms, or disciplinary action if misconduct is discovered. Therefore, the correct answer is option 5) All of the above. These actions demonstrate Congress's role in overseeing and managing the extensive network of federal agencies and departments that constitute the bureaucracy.