(1) A fixed-price contract may be incrementally funded only if—
(i) The contract (excluding any options) or any exercised option—
(A) Is for severable services;
(B) Does not exceed one year in length; and
(C) Is incrementally funded using funds available (unexpired) as of the date the funds are obligated; or
(ii) The contract uses funds available from multiple (two or more) fiscal years and—
(A) The contract is funded with research and development appropriations; or
(B) Congress has otherwise authorized incremental funding.
(2) An incrementally funded fixed-price contract shall be fully funded as soon as funds are available.