DISCHARGE OF TRUSTEE. The trustee may be discharged from his office only as follows
a) by the extinction of the trust; (b) by the completion of his duties under the trust; (c) by such means as may be prescribed by the instrument of trust; (d) by appointment under this Act of a new trustee in his place; (e) by consent of himself and the beneficiary, or, where there are more beneficiaries than one, all the beneficiaries being competent to contract; or (f) by the Court to which a petition for his discharge is presented under this Act.