What upgrading flexibility does SDX provide in this scenario?

• A. The Citrix ADC instances have to be upgraded at the same time.
• B. It is NOT possible to upgrade the Citrix ADC instances to different firmware versions.
• C. The Citrix ADC instance can be upgraded at the SDX management level, allowing all instances to be upgraded at once.
• D. The Citrix ADC instance can be upgraded on an individual basis, allowing all instances to run different firmware versions.

Answer: (C)

SDX centralizes firmware management, letting the SDX management plane upgrade all nested ADC instances in one operation. This means you can push a firmware upgrade from the SDX controller and have every instance on the same version after the update, reducing manual effort and ensuring consistency across the deployment. This is the flexibility being tested: you don’t need to upgrade each ADC instance separately; you can coordinate the upgrade at the SDX level, covering all instances at once. The other options imply rigid per-instance handling, restrict possible versioning across instances, or describe a scenario that isn’t the centralized approach SDX provides. Therefore, upgrading at the SDX management level to upgrade all instances at once is the best fit.