Answer :
Option D is correct. The operating system may regulate the amount of power supplied to each device and shut them off when not in use thanks to the Advanced Configuration Power Interface (ACPI).
Hibernation is the term used to describe this situation. All data is untouched if the power goes out while the machine is in the S4 state. A power outage has no impact on the S4 state because the contents of memory are kept on disk. The operating system is not active at this time. When a computer enters the S3 state using hybrid sleep, the contents of memory are saved to disk, effectively indicating that the computer is in the S3 state but ready for the S4 state.
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