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

The correct answer highlights the importance of understanding the comprehensive context surrounding classified information. Standard markings indeed provide critical details regarding not only the classification level but also traceability related to the information.

Knowing when the information was last used or disseminated is crucial for ensuring that only current, relevant, and necessary information is shared within secure environments. It helps maintain the integrity of the classification system and ensures compliance with policies governing the handling of sensitive information. Knowing by whom the information was used ensures accountability and allows for proper tracking of disclosures and access.

While other choices provide information that could relate to the handling or distribution of classified materials, they do not encompass the same level of detail regarding temporal and author accountability that option B presents. This comprehensive view of data management is vital for security and operational effectiveness within classified environments.