During execution, a functional manager asks you to use a model C generator of model B on your project. The functional manager says that model C will solve the needs of the project and provide some benefits to the manufacturing department. You look at the cost associated with model C and discover that it is substantially higher than model B. If you are not sure you can justify the more expensive model, what do you do ？（）
A．Review the specification of each to validate the manager’s claim
B．Measure the differences in using each model and present them to senior managemen
C．Use model C and cut other tasks to make up for the added cos
D．Do a life cycle analysis and present the results to your bos
