please help me understand with some short written explanations, thank you8

4. Kadence contributed $600,000 to an irrevocable trust with no retained powers in 2020 and did not retain any powers over the transferred assets. She named her only daughter as the sole income and remainder beneficiary and paid gift tax at the date of the transfer of $25,000. In 2022, Kadence died of lung cancer. The fair market value of the property in the irrevocable trust was $3,000,000 at the date of her death. What amount of the trust assets are included in Kadence's gross estate? a. $0. b. $600,000. c. $625,000. d. $3,000,000. 5. A trust created in the will of a decedent is a: a. Standby trust. b. Testamentary trust. c. Trust by will. d. Decedent's trust