The correct answer is (a) System.
The Power option in Windows system is available in the System menu. The System menu is located in the Control Panel. The Control Panel is a collection of applets that allow you to configure the settings of your computer. The System applet allows you to view and change the hardware and software settings of your computer. The Power option allows you to control the power settings of your computer.
The other options are incorrect.
(b) System and Security is a category in the Control Panel. It contains applets that allow you to configure the security and maintenance settings of your computer.
(c) Security is a category in the Control Panel. It contains applets that allow you to configure the security settings of your computer.
(d) File History is a feature of Windows that allows you to back up your files.