Which,if Any,of the Following Statements Properly Characterize Features Involving Buy-Sell

Which,if any,of the following statements properly characterize features involving buy-sell agreements?

A) Agreements cannot be used to control disposition of partnership interests.
B) If properly structured, the agreements can control valuation for estate tax purposes.
C) If a stock redemption is proposed, utilize a cross-purchase type.
D) Arrangements work best when the interest to be transferred involves publicly traded securities.
E) None of the above.