What is the standard of review for a pension plan administrator to deny benefits?

The parties agree that this claim is subject to de novo review. Under this standard, "the court simply proceeds to evaluate whether the plan administrator correctly or incorrectly denied benefits." Opeta v. Nw. Airlines Pension Plan for Contract Emps., 484 F.3d 1211, 1217 (9th Cir. 2007). "[W]hen the court reviews a plan administrator's decision under the de novo standard of review, the burden of proof is placed on the claimant." Muniz v. Amec Constr. Mgmt, 623 F.3d 1290, 1294 (9th Cir. 2010).