To find where the Bharatiya Sakshya Adhiniyam (BSA), 2023 does not apply, it helps to check the governing statute of each forum listed and see whether that statute keeps the forum tied to the ordinary law of evidence or cuts it loose from it.
Only the arbitral tribunal is expressly freed from the reach of the Act by its own governing statute, while the ITAT, NCLT and NGT continue to function as judicial bodies bound by ordinary evidentiary principles.
Therefore, the correct answer is Arbitral Tribunal.