Option 1: The Supreme Court is the highest court in the country and is not considered a part of the subordinate criminal courts. It is the final appellate court and is above all the other courts in the country.

Option 2: The High Court is a level below the Supreme Court but is still higher than the subordinate criminal courts. The High Court acts as an appellate court for subordinate courts and has the power of superintendence over them.

Option 3: The Court of Sessions Judge is the answer. This is the court that is at the apex of the subordinate criminal courts. It has the jurisdiction to hear and decide on serious criminal cases.

Option 4: The Court of District Judge is also a part of the subordinate criminal courts, but it is not at the apex. It has the jurisdiction to hear and decide on criminal cases at the district level.

So, the correct answer is option 3, the Court of Sessions Judge.