The right of election of a surviving spouse may be waived, wholly or partially, by a written agreement, or by a waiver signed by the surviving spouse. A valid waiver by a surviving spouse of a right of election against a will must meet three requirements: 
	1.	It must be in the form of a written contract or agreement;
	2.	It must be signed by the party waiving the right; and
	3.	There must have been fair disclosure.