单选题The current data center has run out of space. A room that is located next to the existing data center is then used to house two racks containing six servers. Six months later， physical housekeeping is performed as part of a mid-year maintenance plan. Which environmental condition discovered in the room is LEAST critical？（）A There are discolored ceiling tiles near the middle of the room.B Large amounts of dust have accumulated in the corners of the room.C The anti-static carpet has been removed resulting in a bare painted concrete floor.D A wet pipe water-based sprinkler system has been installed above the racks.
单选题
The current data center has run out of space. A room that is located next to the existing data center is then used to house two racks containing six servers. Six months later， physical housekeeping is performed as part of a mid-year maintenance plan. Which environmental condition discovered in the room is LEAST critical？（）
A
There are discolored ceiling tiles near the middle of the room.
B
Large amounts of dust have accumulated in the corners of the room.
C
The anti-static carpet has been removed resulting in a bare painted concrete floor.
D
A wet pipe water-based sprinkler system has been installed above the racks.
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