(a) The contracting officer shall insert the clause at 52.242-14, Suspension of Work, in solicitations and contracts when a fixed-price construction or architect-engineer contract is contemplated.

      (b)

(1) The contracting officer may, when contracting by negotiation, insert the clause at 52.242-15, Stop-Work Order, in solicitations and contracts for supplies, services, or research and development.

           (2) If a cost-reimbursement contract is contemplated, the contracting officer shall use the clause with its AlternateI.

      (c) The contracting officer shall insert the clause at 52.242-17, Government Delay of Work, in solicitations and contracts when a fixed-price contract is contemplated for supplies other than commercial or modified-commercial items. The clause use is optional when a fixed-price contract is contemplated for services, or for supplies that are commercial or modified-commercial items.