The project manager learned that the project Schedule Performance Index (SPI) was 0.77. What should the project manager do? 项目经理了解到项目进度的绩效指数（SPI）为0.77。项目经理应该怎么做？ ◑A.Update cost baseline更新成本基准 ◑B.Update schedule baseline更新进度基准 ◑C.Analyze performance on critical paths分析关键路径上的绩效 ◑D.Analyze project management plan分析项目管理计划
