Explanation: In the context of computer hardware, devices are categorized into three main types: storage devices, input devices, and output devices. Each type serves a distinct purpose in the functioning of a computer system.
**Storage Devices:**
Storage devices are hardware components designed to store data and information. They can be either internal or external. Internal storage devices include hard drives and solid-state drives (SSDs) that are built into the computer. External storage devices include USB flash drives (pen drives), external hard drives, and memory cards. These devices allow users to save and retrieve data, ensuring that information is not lost when the computer is turned off.
**Input Devices:**
Input devices are used to input data into a computer. They allow users to interact with the computer and provide it with information. Common examples of input devices include keyboards, mice, scanners, and microphones. These devices convert physical actions into digital data that the computer can process.
**Output Devices:**
Output devices are used to display or output data from a computer. They present the processed information in a form that is understandable to the user. Common examples of output devices include monitors, printers, and speakers. These devices convert digital data into a form that can be seen, heard, or felt.
In the given question, the correct answer is a pen drive, which is a type of storage device. A pen drive, also known as a USB flash drive, is a small, portable storage device that can be connected to a computer via a USB port. It is used to store and transfer files, documents, and other data. The pen drive is a popular choice for portable storage due to its small size, high capacity, and ease of use.
The other options provided are incorrect because they are not storage devices. A keyboard is an input device used to input text and commands into a computer. A monitor is an output device used to display visual information from the computer. A mouse is also an input device used to control the cursor on the screen and interact with graphical user interfaces.
Understanding the distinction between these types of devices is crucial for comprehending the basic functions of a computer system. Each device plays a specific role in the input, processing, and output of data, and recognizing their functions helps in effectively using and managing computer hardware.