Explanation:

- Res sub judice: Refers to a matter that is currently under trial or consideration by a court. It doesn't deal with the final determination or have any binding effect on future litigation.

- Res Judicata: A legal principle where a matter that has been finally decided by a competent court cannot be litigated again by the same parties. It has a binding effect on future litigation.

- Stare decisis: The doctrine of precedent, where past judicial decisions are authoritative in cases with similar facts. It ensures consistency and predictability in the law.

- Both (a) and (b): This option suggests both Res sub judice and Res Judicata have similar effects, which is incorrect as explained above.

Therefore, option 1: Res sub judice does not deal with the final determination of contested questions nor does it have binding effects in future litigation.