Which of the following circumstances would cause the gifted property to be included in the donor's gross estate?
I. Donor retains a life estate in the gift property.
II. Donor retains the power to revoke or amend the gift.
III. Donor gives more than $12,000 to one donee in one year.
IV. Donor dies within three years of gifting land.
a. I, II and III
b. I, II
c. II, IV
d. III, IV