Which type of agreements are exempt from bidding under the specified conditions?

The correct choice pertains to agreements with US, State, county, municipality, and other governmental units. This category is exempt from the bidding process under specified conditions due to the principle of cooperative purchasing and intergovernmental agreements. Governments often collaborate to procure goods and services, which can result in cost efficiencies and increased purchasing power.

These exemptions are founded on the idea that since these entities share jurisdictional boundaries or services, they can enter into agreements without the need for formal bidding. This saves time and resources that would otherwise be spent in a competitive bidding process, allowing for a more streamlined procurement process, particularly in times of urgency or necessity where swift action is required.

The other types of agreements mentioned, while they may also have their own forms of exemptions or considerations, generally are subject to more stringent bidding requirements due to the need for accountability and fairness in spending public funds. In essence, the collaboration between governmental units is recognized as a unique situation that warrants this exemption.