Final answer:
To minimize downtime, a hardware device should be replaced just before its MTBF is reached to prevent unexpected breakdowns and optimize performance.
Therefore, the correct answer is: option D.) Just before its MTBF is reached
Step-by-step explanation:
The MTBF is an estimation of the average time a device will operate before it fails. Therefore, replacing the device before it reaches this point can help prevent unexpected breakdowns and minimize downtime.
For example, if a hardware device has an MTBF of 5 years, it would be wise to replace it around the 4 to 4.5-year mark to ensure optimal performance and avoid potential failures.
By following this approach, organizations can reduce the risk of downtime caused by hardware failures, maintain operational efficiency, and proactively manage their hardware infrastructure. Thus, in order to minimize downtime, a hardware device should be replaced just before its MTBF is reached.