Optional Forms of Benefits include "one of more of the following forms" - are they all protected?

[Guest erisamelissa]

Multiemployer DB Plan is considering merging with another multiemployer DB Plan. DB Plan #1 has language that the optional forms of benefit are "one or more of the following" - basically, lump sum, installments and single life annuity. DB Plan #2 does not contain such language.

Is a combination of optional forms of benefit in and of itself an optional form of benefit? If so, because there are several permutations, might this be eliminated under the proposed regs?