What markings must be changed when information in a bulky document is downgraded?

The correct choice is to change the markings on the cover, title, and/or first pages when information in a bulky document is downgraded. This decision comes from the need for clarity and consistency in how classified information is presented and understood. The cover and title pages typically provide the first indications of the document's classification status, setting expectations for the reader. By updating these key markings to reflect the downgraded status, you ensure that anyone accessing or handling the document is aware of its current classification level, thus enhancing security and compliance.

The internal page markings may also need to be refreshed to maintain consistency throughout the document, but the most critical elements that need immediate attention when downgrading reflect on the cover and title page. These areas are prominently viewed and serve as the primary identifiers of the document's classification level for anyone who comes into contact with it. Therefore, focusing on the markings on the cover, title, and first pages captures the essence of maintaining accurate classification communication following a downgrade.