What should be displayed in the data block before transferring track control?

When preparing to transfer track control in air traffic management, it's essential to display the appropriate status indicators to ensure a smooth and effective handoff. The correct choice reflects the need for information that directly relates to the current condition and readiness of the track being transferred.

Displaying CST, FAIL, NONE prior to transferring track control indicates the status of the flight's compliance or readiness. Here, CST (there could be an assumption that this refers to a certain status or type of indication), FAIL represents any failures in data collection or processing that would affect the transfer process, and NONE indicates that there are no alerts or warnings present that could impede the transfer. This critical information allows the controller to assess the situation quickly and make informed decisions before completing the transfer, thus enhancing safety and operational efficiency.

In contrast, the other options either pertain to different contexts of data management or don’t convey the specific necessary conditions to validate a successful track transfer. For instance, terms like IDENT, CHANGE, and STBY might hint at request or permission statuses, while OLD, NEW, and UPDATE may refer to changes in data versions but lack the immediacy of readiness. DATA, STATUS, REGION could relate to data categorization but do not focus on the key elements required for the control