Which of the following codes is an 8-bit character encoding format?

The code that represents an 8-bit character encoding format is ASCII. ASCII, which stands for American Standard Code for Information Interchange, utilizes 7 bits to represent characters, but it's often stored as 8 bits per character by adding a leading zero to create an 8-bit byte. This means that ASCII can represent 128 unique characters, which include standard English letters, numbers, and some control characters.

In contrast, UTF-8 is a variable-length character encoding that starts with 1 byte for ASCII characters but can extend to multiple bytes for other characters, thus making it not strictly an 8-bit format. ISO-8859-1, while it uses 8 bits and extends ASCII to include additional characters for Western European languages, is often viewed as a distinct character set rather than purely an 8-bit encoding like ASCII. Unicode encompasses various encoding formats, including UTF-8 and UTF-16, and represents a broader character set than can be accommodated within the confines of a simple 8-bit format.

Therefore, identifying ASCII as the 8-bit character encoding format emphasizes its historical significance and the way it aligns with the capacity of a single byte, prompting its classification within this context.