If an Existing Partner Withdraws from a Partnership

If an existing partner withdraws from a partnership,

A) his or her interest may be sold to the partnership or an individual partner.
B) the consideration received for that partner's interest may suggest the existence of undervalued existing assets and/or goodwill.
C) either the bonus or the goodwill method may be used to record the transaction if the partnership acquires the withdrawing partner's interest.
D) all of the above.