What does 'ABC order' refer to?

'ABC order' refers to a system of organizing information alphabetically. This method simplifies the process of locating words, names, or items by arranging them according to the first letter of each entry, progressing through the alphabet. For example, if you were to organize a list of books by their titles, you would place 'A Tale of Two Cities' before 'Moby Dick' because 'A' comes before 'M' in the alphabet. This straightforward organization helps users quickly find what they are looking for and is widely used in libraries, directories, and various lists. The other options represent different systems of organization or methods that do not relate to alphabetical ordering, thus making them unsuitable in this context.