21 A contract is discharged through performance when: O A. it is commercially impractical to perform the contract it is impossible to perform the contract OB. . it is temporarily impossible to perform the contract . each party renders the agreed-upon consideration OD O E none of the other answers is correct QUESTION 22 Performance that is materially different than what was promised under the contract is termed: non-conforming performance OA B. alternative performance C. anterior performance D. substantial performance E ulterior performance SA