Concept:
A computer stores and processes information using the binary number system. The smallest unit of data in a computer is called a bit. Understanding the origin of the term helps in understanding how digital systems represent information.
Step 1: Understand the meaning of the term “bit”.
Computers work with only two possible states:
\[
0 \quad \text{and} \quad 1
\]
These two symbols are known as binary digits because they belong to the binary number system.
Step 2: Analyze the formation of the word “bit”.
The term “bit” was formed by combining two words:
\[
\text{Binary} + \text{Digit}
\]
When these words are shortened and combined, we obtain:
\[
\text{Bit}
\]
Step 3: Relate the term to computer memory.
Each bit can hold only one binary value, either:
\[
0 \quad \text{or} \quad 1
\]
A collection of eight bits forms one byte.
\[
1 \text{ Byte} = 8 \text{ Bits}
\]
Step 4: Select the correct option.
Since the word “bit” comes from “binary digit”, the correct answer is:
\[
\boxed{\text{Binary Digit}}
\]