Which one or ones of the following factors present significant challenges to bond indexing?

Group of answer choices (Can be more than one answer)

A. Some bonds are traded below par value and some above par value.

B. Very large number of bonds in the market

C. Unlike stocks, bonds expires and new bonds need to be acquired as a result

D. Potentially large amount of coupon incomes, which give rise to constant need for reinvetment.

E. Bond market tends to do well when the stock market does badly.