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. W
题目
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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