Arrange the steps involved in chain indexing in Correct order.

(A) Represent the class number in the form of a chain, with each link comprising the class number and its verbal translation in standard terms or phrases from the chosen classification scheme.

(B). Derive subject reference headings from each upper sought link until all terms are exhausted and indexed.

(C). Classify the subject of a document using a preferred classification scheme.

(D). Merge specific subject entries, subject references, and "See" references, arranging them in a single alphabetical sequence.