Based on the following scenarios, suggest Reuse-Oriented Maintenance models out of Quick-Fix Model, Iterative Enhancement Model and Full-Reuse Model. Please provide justifications for your suggestions

a)A software system has to be maintained in only 15 days because the customers cannot wait too long. The errors are not very complicated

b)A software has to be maintained with a number of errors. The company of the software has a complete list of requirements and design documents of the software