Mr. Zimmerman creates an irrevocable trust in his Last and Testament for the benefit of his four children and funds it with stock of his family company, which he created. The Will appoints his oldest son Mark as the trustee, because Mark is the only child who has shown an interest in running the business. After he dies and the trust is funded, the children begin to squabble about how Mark is operating the business. The other three children believe Mark is exhibiting poor business judgement and will cause the business to fail. The in-fighting gets so bad that Mark as the trustee proposes to terminate the trust prematurely and distribute the stock pro-rata to each beneficiary (the four children). What document would need to be signed by all of them in order to accomplish this? (a) A Codicil (b) There is no such document. The trust is irrevocable and cannot be changed. (c) A Trust Amendment (d) A Non-judicial Settlement Agreement under the Uniform Trust Code