What might be the characteristics of abstracts for academic degrees?

A.Abstracts for academic degrees involve the most essential information, including research background, research purpose, methods, results, and conclusions.

B.Abstracts for academic degrees can be viewed as an extended form of abstract, combining the content of indicative abstract and that of informative abstract.

C.Abstracts for academic degrees should provide sufficient information so as to allow a person to decide whether to read the thesis itself or not.

D.All of the above.

正确答案：All of the above.