Which of the Following Best Describes Buy-And-Sell Agreements Among Shareholders

Which of the following best describes buy-and-sell agreements among shareholders of a corporation?

A) They are most often entered into among shareholders of large publicly held corporations because it is difficult to monitor the large numbers of sales of the shares.
B) They always provide for purchase of shares by the corporation in the event that a shareholder desires to sell shares.
C) They can provide for the sale of shares to either the corporation or to other shareholders.
D) They usually also contain an agreement for a voting trust.
E) They are enforceable only if the agreement provides for a fair price.