Final answer:
A serial number is a unique identifier that does not change throughout the life of an asset, making it different from attributes like CPU type, operating system, and memory.
Step-by-step explanation:
An attribute that will remain unchanged throughout the life of an asset is its Serial Number. The serial number is a unique identifier assigned to an asset which helps in its identification and tracking. Unlike the CPU Type, Operating System, and Memory, which can be changed or upgraded, the serial number is permanently associated with the asset and doesn't change.