The contractor shall submit a final settlement proposal covering unvouchered costs and any proposed fee to within 1 year from the effective date of termination, unless the period is extended by the TCO. The contractor shall use the form prescribed in 49.602-1, unless the TCO authorizes otherwise. The proposal shall not include costs that have been-

(a) Finally disallowed by the contracting officer; or

(b) Previously vouchered and formally questioned by the Government but not yet decided as to allowability.