During the upgrading process, which of the following is NOT required?

During the upgrading process of classified information, it is crucial to maintain traceability and clarity regarding the classification levels. Citing the date upgraded ensures that there is a clear record of when the classification was modified, which is essential for audits and understanding the context of the information's security level at any given time. Citing the Original Classification Authority (OCA) or the instruction responsible is also important, as it helps establish accountability and the legal basis for the classification decision. Additionally, increasing the percentage of markings serves to enhance the visibility of the classified information, ensuring that individuals handling the document are fully aware of its sensitivity.

In contrast, removing previous markings is not a requirement during the upgrading process. In fact, keeping original markings may be useful for reference as it shows the document's classification history. This helps maintain a clear lineage of how the classification has evolved, therefore preserving important context and information integrity. Hence, while upgrades are essential, certain requirements, like removing previous markings, are not mandated, making this the correct answer.