12. D transfers $1,000,000 to T in an irrevocable trust, life estate to X, remainder to Y. D retains the power to substitute Z for Y as the remaindennan at any time before X's death. Which of the following statements are true?

A. The gift is incomplete as to the remainder, but complete as to the income interest.

B. The death of X would terminate D's power, which would complete the gift to Y.

C. Both A. and B.

D. None of the above