You have a problem in your company. People often use laptops and will forget they have them
turned on and let the battery run down. You
want to have them go to a low power mode if they are left inactive. Power savings is the most
important issue, but saving programs and files

is also important. It is not important whether or not they return to active state very quickly. Which
low power state should you use?

A.
Standby mode

B.
Sleep mode

C.
Shutdown

D.
Hibernate mode

Explanation:

You should use Hibernate mode. Hibernate mode is a low power state, which saves all data and
open programs to the hard disk and the
laptop shuts down. Since it shuts down that saves power, however, it takes significantly more time
to return to an active state.
What is hibernate mode? Hide
Hibernate mode is a power saving feature for computers. In hibernate mode, the current state of a
computer is saved to
the hard disk, and the computer shuts down. A user will have to power on the computer to restore
the previous settings.
When a computer resumes from hibernate mode, it reads the saved settings from the disk and
restores the system state
as it was before it entered hibernate mode. By default, hibernate mode is disabled. If a computer is
not ACPI-enabled or
APM-enabled, users will have to enter hibernate mode manually. Users cannot set the computer to
automatically hibernate
after a certain time. With ACPI-enabled and APM-enabled computers, users are able to set hibernate
mode automatically.
Answer option C is incorrect. Simply shutting down won’t save any files or settings. And that may
cause serious problems.
Answer options B and A are incorrect. These are low power modes that do not completely shut
down. This means that power is still going and
thus it is not saving power as much as hibernate.
What is sleep mode? Hide
Sleep mode is the state of a computer where it requires a small amount of power needed to keep
available data in active
memory. When a user presses a key on the keyboard, the computer awakes from sleep mode. The
memory data is also
written to a file and saved in the hard disk. If the computer is not awakened after fifteen minutes,
the operating system
puts the computer in hibernate mode, cuts the power, and discards the data in RAM.
What is standby mode? Hide
The standby mode is a power saving feature for computers. In this mode, a computer does not shut
down completely. The
computer goes to low power state and, as a result, it consumes less power. When the computer
resumes from the standby
mode, full power is restored to its devices. During the standby mode, if the power supply is
disconnected or interrupted,

data might be lost. The standby mode is available automatically on ACPI-enabled or APM-enabled
computers. Users do not
need to enable this mode manually. This mode is not available in non-ACPI and non-APM based
computers.
Reference:
http://www.timeatlas.com/mos/Term_to_Learn/General/Understanding_Differences_Between_Hib
ernate_and_Stand_By/