How many levels of classification may appear in the banner line of a document?

The banner line of a document can display two levels of classification to provide essential information at a glance. This configuration allows for the identification of the primary classification level, which indicates the overall sensitivity of the document, alongside an additional designation that could reflect a compartmented or specific category of information. This dual-level approach helps ensure that recipients understand both the primary classification and any special restrictions that may apply, facilitating appropriate handling and safeguarding measures.

However, the other options suggest either a single level, which would not provide sufficient context for documents that require multiple handling caveats, or three to five levels, which could potentially overwhelm the reader and confuse the classification identification process. Maintaining clarity in classification markings is crucial for effective communication of the document's handling requirements.