You are in the middle of executing a major modification to an existing product when you learn that the resources promised at the beginning of the project are not available. The BEST thing to do is to_________. A. show how the resources were originally promised to your project B. re-plan the project without the resources C. explain the impact if the promised resources are not made available D. crash the project 你正在对一个现有产品进行一项重大修改的时候, 得知在项目开始时许诺的资源现在无法获得了, 你最好_________。