substitute agreement

$q,$

Multiple Choice

does not discharge the obligations under the original contract; instead, obligations under the substitute agreement run concurrently with the obligations under the original contract

discharges any obligations under the original contract within thirty $(30)$ days after execution of the substitute agreement

$+$

$q,$

discharges any obligations under the original contract within sixty $(60)$ days after execution of the substitute agreement

immediately discharges any obligations under the original contract