(b) In accordance with section 805 of the National Defense Authorization Act for Fiscal Year 2008 (Pub. L. 110-181), use of time-and-materials and labor-hour contracts for the acquisition of commercial services is authorized only for the following:

(i) Services acquired for support of a commercial product, as described in paragraph (1) of the definition of commercial service at FAR 2.101 (41 U.S.C. 103a).

(ii) Emergency repair services.

(iii) Any other commercial services only to the extent that the head of the agency concerned approves a written determination by the contracting officer that—

(A) The services to be acquired are commercial services as defined in paragraph (2) of the definition of commercial service at FAR 2.101 (41 U.S.C. 103a);

(B) If the services to be acquired are subject to FAR 15.403-1(c)(3)(ii), the offeror of the services has submitted sufficient information in accordance with that subsection;

(C) Such services are commonly sold to the general public through use of time-and-materials or labor-hour contracts; and

(D) The use of a time-and-materials or labor-hour contract type is in the best interest of the Government.