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Which of the following statements BEST describes binary?

  1. A notational system used to represent an “on” or “off” state

  2. Encoding system for text documents

  3. Method of classifying animals

  4. Technique for storing multimedia files

The correct answer is: A notational system used to represent an “on” or “off” state

Binary is a notational system that is used to represent only one of two states - "on" or "off". Option B is incorrect as binary is not specifically used for encoding text documents, but rather can be used for any type of data. Option C is incorrect as binary does not relate to the classification of animals. Option D is incorrect as binary is not a technique exclusively used for storing multimedia files, but can also be used to store other types of data. Therefore, the best description of binary is as a notational system for representing "on" or "off" states.