(a) Any allocation made by the Board must—

(1) Be authorized by the concurring vote of a majority of the total membership of the Board;

(2) Be made in writing, signed by the Chairman of the Board and acknowledged in writing by the receiving Board member or members;

(3) Set forth the duties and responsibilities allocated, either in the body of the document or by reference to another document existing at the time of the allocation; and

(4) Be communicated in an appropriate written form to the Executive Director, the participants and the beneficiaries of the Thrift Savings Fund.

(b) Any allocation made by the Executive Director must—

(1) Be made in writing, signed by the Executive Director and acknowledged in writing by the receiving fiduciary;

(2) Set forth the duties and responsibilities allocated, either in the body of the document or by reference to another document existing at the time of the allocation; and

(3) Be communicated in an appropriate written form to the participants and beneficiaries of the Thrift Savings Fund.