Which Aruba OS feature should the administrator implement to reduce the amount of downtime the Aps will experience at the time of the upgrade process?

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An administrator wants to reduce downtime of the wireless network when controllers are upgraded .

Which Aruba OS feature should the administrator implement to reduce the amount of downtime the Aps will experience at the time of the upgrade process?
A . Centralized upgrades
B . AP apboot mode bypass
C . AP fast start
D . AP image preload

Answer: D