What follows is an opinion from the Supreme Court of the United States. Your task is to determine the bases on which the Supreme Court rested its decision with regard to the legal provision that the Court considered in the case. Consider "judicial review (national level)" if the majority determined the constitutionality of some action taken by some unit or official of the federal government, including an interstate compact. Consider "judicial review (state level)" if the majority determined the constitutionality of some action taken by some unit or official of a state or local government. Consider "statutory construction" for cases where the majority interpret a federal statute, treaty, or court rule; if the Court interprets a federal statute governing the powers or jurisdiction of a federal court; if the Court construes a state law as incompatible with a federal law; or if an administrative official interprets a federal statute. Do not consider "statutory construction" where an administrative agency or official acts "pursuant to" a statute, unless the Court interprets the statute to determine if administrative action is proper. Consider "interpretation of administrative regulation or rule, or executive order" if the majority treats federal administrative action in arriving at its decision.Consider "diversity jurisdiction" if the majority said in approximately so many words that under its diversity jurisdiction it is interpreting state law. Consider "federal common law" if the majority indicate that it used a judge-made "doctrine" or "rule; if the Court without more merely specifies the disposition the Court has made of the case and cites one or more of its own previously decided cases unless the citation is qualified by the word "see."; if the case concerns admiralty or maritime law, or some other aspect of the law of nations other than a treaty; if the case concerns the retroactive application of a constitutional provision or a previous decision of the Court; if the case concerns an exclusionary rule, the harmless error rule (though not the statute), the abstention doctrine, comity, res judicata, or collateral estoppel; or if the case concerns a "rule" or "doctrine" that is not specified as related to or connected with a constitutional or statutory provision. Consider "Supreme Court supervision of lower federal or state courts or original jurisdiction" otherwise (i.e., the residual code); for issues pertaining to non-statutorily based Judicial Power topics; for cases arising under the Court's original jurisdiction; in cases in which the Court denied or dismissed the petition for review or where the decision of a lower court is affirmed by a tie vote; or in workers' compensation litigation involving statutory interpretation and, in addition, a discussion of jury determination and/or the sufficiency of the evidence.

Opinion:
WALTON v. ARKANSAS.
No. 18, Misc.
Decided October 22, 1962.
John C. Finley, Jr. for petitioner.
Frank Holt, Attorney General of Arkansas, and Thorp Thomas and Jack L. Lessenberry, Assistant Attorneys General, for respondent.
Per Curiam.
The motion for leave to proceed in forma pauperis and the petition for a writ of certiorari are granted.
In this capital case the Supreme Court of Arkansas sustained. petitioner’s conviction against the claim, among others, that in violation of the Fourteenth Amendment to the Constitution of the United States his involuntary confession of the crime was introduced in evidence at the trial. Walton v. State, 233 Ark. 999, 350 S. W. 2d 302. Petitioner contends that independently of this claim his conviction was unconstitutional because he was not represented by counsel at the time of his arraignment in the course of which he acknowledged the voluntariness of his confession, such acknowledgment being later used in evidence against him at the trial.
When the Arkansas Supreme Court decided this case it did not have the benefit of this Court’s decision in Hamilton v. Alabama, 368 U. S. 52, which was rendered subsequent to the state court’s decision and on the same day that it denied rehearing upon a petition filed prior to the announcement of the Hamilton case. Further, we are unable to conclude from the record filed in this Court either that petitioner had counsel at the time of the arraignment proceedings or, if not, that he was advised of his right to have counsel at such proceedings and that he understandingly and intelligently waived that right.
In these circumstances we conclude that the judgment of the Supreme Court of Arkansas should be vacated and the case remanded to that court for further consideration in light of Hamilton v. Alabama, supra, or for such other appropriate proceedings as may be available under state law for resolution of this constitutional claim.
It is so ordered.

Question: What is the basis of the Supreme Court's decision?

Choices:
judicial review (national level)
judicial review (state level)
Supreme Court supervision of lower federal or state courts or original jurisdiction
statutory construction
interpretation of administrative regulation or rule, or executive order
diversity jurisdiction
federal common law

Answer: 2