Chang, a florist, contracted with Torres to provide delivery services in the local community. Torres discovered that his vehicles did not have the equipment to handle the work well, so he asked Chang if another delivery service, Rush Truk, would be acceptable to him. After some meetings with Torres and Rush Truk, Chang agreed to the change in delivery services. a. Is Torres responsible for the performance of Rush Truk? b. Is this a valid assignment? c. Is this an example of a novation?