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【单选题】
A large company has over 500 computers that currently stay powered on indefinitely. None of the systems are used after the company closes at 5 p.m. Which of the following would be the MOST effective way for the company to save on electricity usage？（）A.
Set the computers for automatic log-off after one hour of inactivity.
B.
Institute a policy of either shutdown or sleep mode an hour after close.
C.
Turn on the Wake on LAN functionality for all computers.
D.
Schedule all patching to be done during work hours.
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