In January of 2015, Curtis created an irrevocable trust. Donna (age 35) was to receive income for life and the remainder to be distributed to Donnas children upon Donnas death. Curtis funded the trust with stock and bonds worth $750,000. Roberta was named the trustee. Donna died in January of 2019 when the trust was worth $1,000,000. How much of the trust was included in Donnas estate?

1. $1,000,000

2. $750,000

3. $0

4. $500,000

5. $250,000