Mark agrees to pay Diane $$8,000$ for her to repair Mark's car. After Diane finishes, Mark honestly believes that she did not do a satisfactory job and that he legitimately only owes her $$5,200$ for the performance. They sign an agreement in which Mark$-$promises to pay $$5,200.$ Diane agrees that this is a fair value for the work done. This is

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specific performance.

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a novation.

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a mutual agreement to rescind.

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an accord and satisfaction.