Describe the dynamic relationship between earned value metrics

Describe the dynamic relationship between earned value metrics and managing risk. Your response should address the following elements:

• How metrics like cost performance index (CPI), schedule performance index (SPI), estimate at completion (EAC), to-complete performance index (TCPI), and variance contribute to identifying and quantifying risk
• The role of the control account manager (CAM) in identifying, managing, reporting, and acting on risk
• The difference between risk at the control account level versus risk at the project level, the program level, and the portfolio level