Loretta's will establishes a by-pass trust at her death which also gives her husband Rex a right to exercise a general power according to an ascertainable standard. How much of the trust corpus will be included in Rex's estate at his death?
a. The full fair market value of the trust is included in Rex's gross estate.
b. No amount attributed to the trust is included in Rex's gross estate.
c. The greater of $5,000 or 5% of the trust corpus is included in Rex's gross estate.
d. The amount subject to the general power of appointment is included in Rex's gross estate.