Which of the following is an example of an expendable resource?

An expendable resource is defined as a resource that is used up or consumed in the process of carrying out operations or tasks and is not typically recovered or reused after its initial use.

In this context, foam is an example of an expendable resource because it is specifically designed for immediate use in firefighting operations to suppress flames and cool hot surfaces. Once foam is deployed, it is consumed in the process of extinguishing a fire, and it is not generally recovered for reuse after application.

In contrast, fire trucks and personnel are considered either reusable or capital resources, as they are not consumed during a single use and can be utilized repeatedly across different incidents. Water supplies, while vital in firefighting, are also not classified as expendable in the same sense; they can be replenished and reused for multiple firefighting efforts.