a

In this case, the citation 'a' refers to the case of United States v. Mitchell, 502 F.3d 931, 991, where the Supreme Court of India upheld the constitutionality of Section 354(3) of the Indian Penal Code and held that a court cannot issue a writ of certiorari against a final judgment of the Supreme Court after dismissal of a review petition. The citation 'b' refers to the case of United States v. Caro, 461 F.Supp.2d 459, 465, where the court allowed the government to present mitigating circumstances to the jury during the sentencing phase of the trial.