Which type of information requires careful transmission and transportation to safeguard against unauthorized disclosure?

Controlled Unclassified Information (CUI) is designed to protect sensitive information that, while not classified, still requires safeguarding against unauthorized disclosure. CUI encompasses a wide range of data that could compromise privacy, safety, or institutional integrity if mishandled. This type of information mandates specific handling techniques to ensure compliance with regulations and to mitigate risks associated with improper exposure.

In contrast, unclassified information does not have the same level of sensitivity and generally does not require stringent protective measures. Digital information, as a category, does not inherently require careful handling unless it's classified or CUI. Furthermore, information not related to national security may not necessarily require the same level of protection as CUI, as the latter often includes vital operational, administrative, or sensitive personal data that necessitates careful transmission and transportation protocols. Thus, CUI is the type of information that emphasizes the need for vigilance in safeguarding against unauthorized access or disclosure.