Mutual Mistakes May Arise

Mutual mistakes may arise:

A) only when parties unintentionally use terms in their contract that are ambiguous.
B) only when parties are mistaken about the subject matter of their agreement.
C) when parties intentionally use terms in their contracts that are ambiguous which leads to mistaken notions regarding the subject matter of the agreement.
D) when there is unintentional usage of ambiguous terms in the agreement and when the matter of the agreement is not properly understood by either party.