单项选择题 Creating WBS means subdividing the major project deliverables into smaller components until the deliverables are defined to the level（）

单项选择题 Configuration management system can be used in defining approval levels for authorizing changes and providing a method to validate approved changes.（）is not a project configuration management tool.

单项选择题 Changes may be requested by any stakeholder involved with the project, but changes can be authorized only by（）