(a) If the will, card or other document or executed copy thereof has been delivered to a specified donee, the donor may amend or revoke the gift by:
(1) The execution and delivery to the donee of a signed statement;
(2) An oral statement made in the presence of 2 persons and communicated to the donee;
(3) A statement during a terminal illness or injury addressed to an attending physician and communicated to the donee; or
(4) A signed card or document found on the person or in the person's effects.
(b) Any document of gift which has not been delivered to the donee may be revoked by the donor in the manner set in subsection (a) of this section or by destruction, cancellation or mutilation of the document and all executed copies thereof.
(c) Any gift made by a will may also be amended or revoked in the manner provided for amendment or revocation of wills or as provided in subsection (a) of this section.
(d) Unless a revocation of a gift under this section includes an objection or refusal to make a gift of a part, it shall not prohibit a person listed in § 2711(c) of this title from authorizing such a gift.