The parol evidence rule:

	a.	allows the introduction of conflicting oral testimony relating to contractual obligations if the parties had an oral agreement prior to forming a fully integrated written contract.
	b.	requires contracts for the sale of real property to be in writing.
	c.	prevents one spouse from providing oral or written testimony against the other in court or any legal proceeding which could result in criminal punishment.
	d.	governs the extent to which parties to a case may introduce into court evidence of a prior or contemporaneous agreement in order to modify, explain, or supplement the contract at issue.