Standard markings identify not only classified information but also who classified it and what additional detail?

The correct choice provides essential information that standard markings must include to ensure proper handling and accountability of classified materials. Specifically, it highlights the importance of knowing when the information was last used or disseminated and by whom, which is crucial for maintaining the integrity and security of classified information throughout its lifecycle. This detail helps authorized personnel to trace the history of the information, understand its current relevance, and comply with regulations pertaining to its access and dissemination.

This detail fosters accountability, ensuring that there is a clear record of who interacted with the information and when, which is critical in a classified environment where information security is paramount. Understanding the timeline of classification and dissemination is vital for managing classified data effectively and assessing any potential risks associated with its exposure.