Before installing array rails for a FlashArray system in a square-hole rack, the cage nuts should be placed on the front of the rack. More specifically, they should be installed three holes up from where the bottom of the rail flange will be.
Interpreting this instruction in the context of rack units (RU), where each RU typically contains three holes, "three holes up from the bottom of the rail" translates to the top square of the lowest RU that the rail will occupy.
Therefore, the correct answer is: C. Top square of the lowest RU
Correct answer can be found on the following pure storage documentation: 50-0027-05.pdf FlashArray//XL Installation Guide
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