29 CFR 4041A.42: A.42 Method of distribution.

(a) In general. The plan sponsor shall distribute plan assets by purchasing from an insurer contracts to provide all benefits required by § 4041A.43 to be provided in annuity form and by paying in a lump sum (or other alternative elected by the participant) all other benefits.

(b) Missing participants and beneficiaries. The plan sponsor must distribute plan benefits of missing distributees in accordance with subpart D of part 4050 of this chapter.