Which of the following is true of ownership changes in a partnership? O O O O A. Admitting a new partner does not change the core structure of the old partnership B. Any time the partner mix changes, the old partnership ceases to exist and a new partnership begins C. A person can become a partner by purchasing an existing partner's interest, even without the approval of the other partners. D. The purchase of an existing partner's interest is a transaction between the new partner and the partnership firm