The intent of the first sentence of 48 CFR 31.102 is that applicable subparts of 48 CFR part 31 shall be used by the Government in—

(a) Pricing fixed-price prime contracts and modifications,

(b) Evaluating the reasonableness of a prime contractor's (or prospective prime contractor's) proposed subcontract (or subcontract modification) prices, and

(c) Determining the allowability of contractor payments to subcontractors in accordance with the provisions of 48 CFR 31.204(b).