Which statement accurately describes the upgrade option that updates components without taking the entire system offline?

• A. Non-disruptive upgrades require downtime.
• B. Upgrades should only be tested in production.
• C. Rolling upgrades are not described.
• D. Non-disruptive upgrades update components without taking the entire system offline.

Answer: (D)

Non-disruptive upgrades are designed to update components without taking the whole system offline, typically by performing rolling upgrades where individual nodes or modules are upgraded one at a time while the rest of the system continues to serve workloads. This approach keeps the system available because traffic is handled by the other parts during the upgrade window. The statement that non-disruptive upgrades require downtime goes against how this method works. Rolling upgrades are a common way to implement non-disruptive upgrades, not something that’s omitted. Being mindful of best practices, upgrades should be tested in a controlled environment before production, rather than assuming production testing only.