Which of the following can be used to change fan speeds?

Device Manager manages operating system drivers and does not have controls for adjusting fan speeds or hardware fan headers.

BIOS/UEFI firmware has direct access to system hardware monitoring and fan control headers on the motherboard, allowing users to configure fan speed profiles, set temperature thresholds, and adjust RPM curves. These settings operate at the hardware level below the operating system, making BIOS the appropriate place to control fan behavior. Most modern BIOS interfaces include a dedicated hardware monitor or Q-Fan/Smart Fan section for this purpose.

Power Options in Windows adjusts CPU power states and processor throttling, not physical fan speed control.

Action Center is a Windows notification and quick settings panel with no hardware fan control functionality.