In personal computer hardware, the main system board inside the cabinet is also known as the

Introduction / Context:
This question is about the primary circuit board found inside a desktop or laptop computer. This board holds major components such as the CPU, memory slots, and expansion slots, and connects all other hardware devices together. Over time, different names have been used for this board, and understanding that several of them are synonymous is helpful for reading technical documentation and exam questions.

Given Data / Assumptions:

• The device in question is the main system board inside a personal computer.
• The options include motherboard, main circuit board, and baseboard, as well as all of the above.

Concept / Approach:
The primary board in a computer is most commonly called the motherboard. However, it can also be accurately described as the main circuit board or the baseboard because all other boards and components attach to it. Many textbooks explain that system board, main board, motherboard, and baseboard are equivalent ways to refer to the same component. Therefore, if the question asks which of the listed terms refers to the system board, and all listed terms are correct, the correct answer is all of the above.

Step-by-Step Solution:
Step 1: Evaluate option A, motherboard. This is the most popular name used in everyday speech and in hardware marketing, and it definitely refers to the system board. Step 2: Evaluate option B, main circuit board. This is a descriptive phrase indicating that the board is the central circuitry of the computer, which matches the role of the system board. Step 3: Evaluate option C, baseboard. This term is sometimes used in technical specifications and is also a synonym for the system board. Step 4: Recognise that since all three labels correctly describe the same hardware, option D, all of the above, must be the best answer.

Verification / Alternative check:
You can confirm this by checking hardware textbooks or repair guides, many of which introduce the term motherboard and then mention that it is also known as the system board, main board, or baseboard. The diagrams showing CPU sockets, RAM slots, and expansion slots all refer to this same major board, regardless of which synonym is used.

Why Other Options Are Wrong:
Motherboard: This alone is not fully wrong because it is a correct synonym, but the presence of other correct synonyms means it is incomplete compared with all of the above.
Main circuit board: This alone is incomplete for the same reason. It is accurate but not the most comprehensive answer when multiple correct labels are given.
Baseboard: This is also a correct but incomplete term for the system board when considered alone. The question expects the answer that acknowledges all synonyms.

Common Pitfalls:
Many learners quickly choose motherboard because it is the most familiar and then ignore the other options. However, multiple choice questions often require you to notice when several statements are all correct and therefore need an all of the above response. It is a good habit to check each option before finalising your answer, especially when an all of the above choice is present.

Final Answer:
The system board is also known as the All of the above, that is, it may be called the motherboard, main circuit board, or baseboard.