The policies of this subpart shall apply to the following procurement instruments, to include amendments, modifications, and change orders thereto:

1. (a) Solicitations.

2. (b) Contracts, including, but not limited to, Governmentwide acquisition contracts (GWACs), multi-agency contracts (MACs), Federal Supply Schedule (FSS) contracts, indefinite-delivery contracts, and purchase orders.

3. (c) Agreements that include pre-priced supplies or services.

4. (d) Task and delivery orders.