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What is the difference between a rolling upgrade and a simultaneous upgrade?

A. A simultaneous upgrade reboots all nodes at the same time after upgrade. And a rolling upgrade will
reboot each node in sequence after upgrading it.

B. A rolling upgrade will upgrade OneFS and then the firmware. And a simultaneous upgrade does both at
the same time.

C. A rolling upgrade requires a reboot confirmation to proceed while a simultaneous upgrade starts with the
lowest LNN.

D. A simultaneous upgrade reboots all nodes before the upgrade and a rolling upgrade reboots each node
after upgrade.

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