Explanation
Documenting the findings is the last step in the troubleshooting process, after verifying full system functionality. Documenting the findings helps to create a record of the problem and the solution, which can be useful for future reference or training purposes. Questioning the users, determining if anything has changed, and gathering information are steps that precede verifying full system functionality in the troubleshooting process. References: The Official CompTIA IT Fundamentals (ITF+) Student Guide (Exam FC0-U61), Chapter 2: IT Concepts and Terminology1

A GPU (Graphics Processing Unit) is a specialized electronic circuit designed to rapidly manipulate and alter memory to accelerate the creation of images in a frame buffer intended for output to a display device. One of the primary roles of the GPU in gaming is to enhance in-game physics, which refers to the laws and rules that govern the behavior and interaction of objects within a game. GPUs are designed to handle complex calculations quickly and efficiently, making them ideal for handling the physics calculations required in modern video games. By offloading these calculations to the GPU, game developers can create more realistic and immersive games without overloading the CPU (Central Processing Unit). References: CompTIA IT Fundamentals (ITF+) Certification Guide, page 23; What is the GPU's role in enhancing in-game physics and simulations?

Plug-and-play installation refers to the technology that allows the operating system to detect and configure new devices automatically as soon as they are connected to the computer, without the need for user intervention. This typically involves the automatic installation of the necessary drivers that enable the operating system to communicate with the hardware device, making the device ready for use quickly and efficiently.
Reference: Plug-and-play technology is a fundamental concept in understanding hardware and operating system interactions, as covered in the CompTIA IT Fundamentals and other basic IT educational materials.

The process of determining the source of an issue during troubleshooting is called diagnosing. Diagnosing is the third step in the troubleshooting process, after gathering information and determining if anything has changed. Diagnosing involves analyzing the symptoms and possible causes of the problem, testing hypotheses, and identifying the root cause of the problem. Researching is the process of finding relevant information or resources to help solve a problem during troubleshooting. Researching can be done before or after diagnosing, depending on the availability and reliability of the information or resources. Sourcing is not a term used in troubleshooting, but it may refer to the process of finding or obtaining materials or components for a product or service. Triaging is not a term used in troubleshooting, but it may refer to the process of prioritizing problems or tasks based on their urgency or importance.
References: The Official CompTIA IT Fundamentals (ITF+) Student Guide (Exam FC0-U61), Chapter 2: IT Concepts and Terminology1