The correct answer is option 3, High Court. Subordinate courts are lower courts that operate below the High Court in the judicial hierarchy. They include district courts, specialized courts, and other lower courts. While the Supreme Court is the highest judicial authority in a country, it does not directly supervise subordinate courts. The role of the Supreme Court is to ensure that laws and decisions are consistent with the constitution. On the other hand, the High Court has the responsibility of supervising and controlling the subordinate courts within its jurisdiction. This includes ensuring proper administration of justice, issuing guidelines and instructions, and hearing appeals from decisions made by subordinate courts. Therefore, it is the High Court that provides the necessary supervision and guidance over subordinate courts.