Which description fits the concept of machine code?

Machine code is a low-level programming language that consists of binary-coded instructions that a computer's central processing unit (CPU) can directly execute. It is composed of bits (0s and 1s), which represent specific instructions to the hardware. Each instruction in machine code corresponds to operations that the computer can perform, such as arithmetic calculations, data movement, or control functions.

The significance of machine code lies in its closeness to the hardware level, meaning that it is optimized for the specific architecture of the computer it runs on. Unlike high-level programming languages, which are designed to be more human-readable and require compilation or interpretation to be converted into machine code, the machine code itself is what ultimately runs on the hardware.

This understanding highlights why the correct description of machine code is that it is a binary-coded instruction set for a computer. The other options do not capture the essence of machine code: high-level programming languages involve more abstraction and human-readable syntax, debugging tools are used for checking code for errors, and graphical programming interfaces offer a visual approach to coding rather than a raw instruction set that the computer directly interprets.