Who is defined as a Classifier in the context of security classifications?

• A. A person who marks and classifies information.
• B. A person who makes a classification determination and applies a classification category to information or material.
• C. An adjudicative security officer.
• D. A program manager responsible for safeguards.

Answer: (B)

The key idea is that a classifier is the person who determines how sensitive information should be and then applies the appropriate classification category to that information or material. This role involves evaluating the content, referencing classification guides or policies, deciding the level (for example, Confidential, Secret, Top Secret) and any applicable compartments, and then applying those markings to the material. It’s not just about physically marking a document or about roles tied to adjudication or program management; it’s about making the determination and executing the classification by assigning the correct category.