Step 1: Issue before the Court.
The Supreme Court examined whether a writ petition under Article 32 is maintainable when a similar petition under Article 226 has already been decided on merits.
Step 2: Ruling in Daryao’s case.
In {Daryao v. State of Uttar Pradesh}, the Court held that the principle of res judicata applies to writ petitions to prevent abuse of process and multiplicity of proceedings.
Step 3: Conclusion.
Accordingly, if a High Court has dismissed a petition on merits under Article 226, a subsequent petition under Article 32 on the same cause of action is barred. Hence, option (D) is correct.