Which of the following colors is used for ultra secret information?

Some security classification frameworks and certification training materials use yellow as the color designator for the highest tier of classified information, labeled ultra secret. This visual color-coding system allows personnel to quickly identify the sensitivity level of physical documents and materials at a glance.

Blue is associated with a lower classification level such as confidential or secret in color-coded classification systems, not the highest ultra secret tier.

Red is used in some classification color schemes to indicate a secret-level designation, which is below the ultra secret tier.

Orange does not correspond to the ultra secret classification level in the color-coding schemes referenced by this type of question.