Which of the following describes physical sources in investigations?

The answer is correct because physical sources in investigations refer to tangible objects or documents that can be used to gather information and evidence. This includes items such as contracts, files, photographs, or any physical materials that can be analyzed or referenced during an investigation. These sources are crucial as they provide concrete evidence that can support or undermine a case.

Other types of sources mentioned, such as intuition and insight, refer to subjective assessments rather than physical evidence. Witness testimonies, while valuable, are verbal accounts and do not fall under the category of physical sources since they rely on memory and perception rather than tangible evidence. Lastly, logistical support from other investigators pertains more to operational aspects of an investigation rather than physical sources of information. Thus, the defining characteristic of physical sources is their tangible nature, making documents and records the most accurate description.