A(n) ___________ is the result of an error by one party about a material fact. If both parties to a contract are mistaken about a material fact, either can opt to rescind it. This is known as a(n) ___________.

• misrepresentation; mutual mistake
• mutual mistake; unilateral mistake
• concealment; mutual mistake
• unilateral mistake; misrepresentation
• unilateral mistake; mutual mistake

Wouldn't the answer to this be mutual mistake; then unilateral mistake.