单项选择题
An administrator sees that smoke is coming from the UPS. Which of the following should they doFIRST？（）
A.Use a Class A fire extinguisher.
B.Evacuate personnel.
C.Install additional fans in the UPS
D.Backup the servers.
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Whilereviewingthebackuplogsaserveradministratornoticesthatabackupjobforanapplication serveronthesamesubnethasfailed.WhichofthefollowingisMOSTlikelytheproblem？（）
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