What type of information needs proper authority before transmission via non-DoD accounts?

The correct answer identifies that transmission of classified information, controlled unclassified information, and other Department of Defense (DoD) information requires proper authority before being shared through non-DoD accounts. This is crucial to ensure the protection of sensitive data and to maintain the integrity and security of the information being handled.

Classified information is inherently sensitive and should only be disclosed through secure channels designated for such data to prevent unauthorized access. Controlled unclassified information, while not classified, still requires protection as it may relate to national security or other operational matters. Additionally, some other DoD information, even if it is not formally classified, may still be subject to restrictions and protocols that dictate how and where it can be shared. These measures help prevent data leaks, maintain operational security, and comply with regulations governing the handling of sensitive information.

Other options relate to types of information that do not have the same level of restriction or requirements for authority. Personal information may need protection, but not necessarily through the same rigorous standards as DoD-related content. Publicly available information is not restricted and thus does not require such authorization.