The correct answer to this question is hardware. The definition of hardware is that it is the components of a computer. A keyboard is attached to the computer and gives the user the ability to type. A mouse is also connected to the computer and used to scroll through pages, as well as click.
A tower case is what holds various components of the computer. Other examples of hardware include a disk drive and joystick. A and C wouldn't be correct for they are downloaded products and used on a computer. D is the device itself, which is why it is incorrect.
The correct answer is hardware.
Keyboard, mouse, and tower case are examples of hardware.
Hardware are known as the physical elements or component of the computer, other examples include to mention but a few monitors, the central processing unit (CPU), joystick, hard disk drive.
All other options are wrong.
Softwares are programmed instructions stored in the computer system for execution by the processor examples are operating systems, firmware, drivers etc.
A computer is a device that accesses and process data to give information.
An application is a software program on a computer system.