Which of these statements explains a way that the bureaucracy stays independent?

Those who work in the bureaucracy are up for reelection every two years
Those who work in the bureaucracy are civil servants
Those who work in the bureaucracy are elected by citizens
Those who work in the bureaucracy have no say in regulations that are created

The statement "Those who work in the bureaucracy are civil servants" explains a way that the bureaucracy stays independent. Civil servants are non-partisan government employees who are hired and retained based on merit and expertise, rather than being tied to political appointments or elections. This helps ensure that the bureaucracy remains independent and not subject to frequent changes based on political cycles.