The correct answer is C. ASCII.
ASCII stands for American Standard Code for Information Interchange. It is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices.
ASCII codes are represented by seven-bit numbers, ranging from 0 to 127. Each number corresponds to a different character, such as a letter, number, or symbol.
ASCII is a widely used standard, and is supported by most computers and other devices. It is the most common character encoding used for text files, and is also used in many other applications, such as email, web pages, and programming languages.
BCDIC stands for Binary Coded Decimal Interchange Code. It is a character encoding standard that was developed by IBM in the 1960s. BCDIC codes represent text in computers using eight-bit numbers.
BCD stands for Binary Coded Decimal. It is a number system that uses four bits to represent each decimal digit. BCD is often used in computers to represent numbers that are used in business applications.
None of these is not a valid answer.