In which of the following situation a party's duty to perform cannot be discharged?

Question

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Situation in which a party's duty to perform cannot be discharged is nonoccurrence of a condition subsequent.Some situations in which a party's duty to perform could be discharged: the occurrence of a condition subsequent,the nonoccurrence of a condition precedent,material or anticipatory breach by the other party,and excused nonperformance.

In Which of the Following Situation a Party's Duty to Perform