(a) A community property survivorship agreement made in accordance with this chapter may be revoked as provided by the terms of the agreement.
(b) If a community property survivorship agreement does not provide a method of revocation, the agreement may be revoked by a written instrument:
(1) signed by both spouses; or
(2) signed by one spouse and delivered to the other spouse.
(c) A community property survivorship agreement may be revoked with respect to specific property subject to the agreement by the disposition of the property by one or both spouses if the disposition is not inconsistent with specific terms of the agreement and applicable law.