Which of the following is/are the important features of AACR-2 are

(A). Discontinued entries under the names of places for certain institutional bodies.

(B). Added title headings for works produced under editorial direction

(C). Offered two levels of description, making it adaptable for various library types.

(D). Provided a standardized framework for describing all library materials, aligned with International Standard Bibliographic Description (ISBD).