Which statement is correct about the Feature Byte and Build ID?

The statement regarding the Feature Byte and Build ID being entered into the system BIOS after replacing a system board is accurate because these identifiers are essential for ensuring the proper functioning of the system with the new board. The Feature Byte contains information about the system configuration and any specific features that were included in the original build. After a system board replacement, it is crucial to enter the correct values for these identifiers into the BIOS to ensure compatibility and functionality for all hardware and software components. This process helps the system correctly recognize the specifications and features of the new board, which is pivotal for the overall performance and reliability of the device.

In contrast, the other statements do not accurately reflect the role of the Feature Byte and Build ID. For example, these identifiers do not appear directly under the serial and part numbers on the service tag, nor must customers contact HP Support to obtain them, unless they are replacing specific components and need assistance. They also are not incorporated as part of the model key on the service tag; instead, they serve specific technical functions that align with the operation of the device after a hardware change.