Correct Option (A)
A byte is a fundamental unit of digital information in computing, comprising eight binary digits (bits). Each bit can represent one of two states, typically 0 or 1. This eight-bit structure allows a byte to represent 2⁸ (256) distinct values, which is sufficient to encode a single character in many character encoding schemes, such as ASCII.
Incorrect Options:
Options B, C, and D are incorrect because they misrepresent the composition of a byte:
- Option B (eight decimal digits): Decimal digits are base-10 numbers (0-9). Computers operate on a binary system, not decimal, at the fundamental hardware level.
- Option C (two binary digits): A unit of two binary digits is known as a nibble, not a byte. A byte specifically consists of eight bits.
- Option D (two decimal digits): This option incorrectly combines the concepts of decimal digits and an insufficient quantity for a byte.