C.
Slot 3 is reserved for the Infiniband card used in non-disruptive upgrades. (FlashArray//M and //XR1 to //XR2 or //XR3
Upgrade Guide, 40-0159-09.pdf)
Given more information:
When executing a FlashArray upgrade from an FA-405 to a FlashArray//X Series, specifically referring to FlashArray//XR2 and //XR3 models which are part of the //X Series, the 2-Port InfiniBand Card should be installed into PCIe slot 3. This slot is explicitly noted as "reserved for upgrades Infiniband card" on both FlashArray//XR2 and //XR3 controller ports diagrams
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