What is the test for establishing that a final policymaking authority in the area of decision?

matter of state law, a final policymaking authority whose edicts or acts may fairly be said to represent official policy in the area of decision"; or (3) "by showing that an official with final policymaking authority either delegated that authority to, or ratified the decision of, a subordinate." Villegas v. Gilroy Garlic Festival Ass'n, 541 F.3d 950, 964 (9th Cir. 2008) (quoting Ulrich v. City & Cty. of San Francisco, 308 F.3d 968, 984-85 (9th Cir. 2002)).