单项选择题

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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