How is a decrease in classification level reflected in documents?

A decrease in classification level for documents is typically reflected through the diminishment of portion markings and banner markings. This means that when a document's classification level is reduced, the indicative markings that signify the sensitivity or classification level of the content are altered to reflect the new, lower classification.

Portion markings indicate which specific sections of a document are classified and at what level, while banner markings provide an overall classification of the entire document at the header or footer. When the classification is lowered, these markings are adjusted to ensure they accurately represent the current status of the information. This adjustment is crucial for maintaining compliance with security protocols and ensuring that sensitive information is appropriately identified and handled.

In contrast, simply removing all markings could lead to ambiguity regarding the document's handling requirements, which is why such an approach is not appropriate for indicating a change in classification. Other options, like changing document ownership or updating classifier contact information, do not directly relate to how the classification level of the document itself is mechanically represented on the document.