What is the test for determining whether a settlement is fundamentally fair, adequate and reasonable?

Amchem , 521 U.S. at 623, 117 S.Ct. 2231 (1997). When the district court determines that a proposed settlement is fundamentally fair, adequate, and reasonable, our review "is extremely limited." Hanlon , 150 F.3d at 1026. We consider the overall fairness of "the settlement taken as a whole, rather than the individual component parts," because "[n]either the district court nor this court ha[s] the ability to delete, modify or substitute certain provisions. " Id. (quoting Officers for Justice v. Civil Serv. Commn , 688 F.2d 615, 630 (9th Cir. 1982) ).