The CM must take an ______ role in Safety management.

The correct answer is Active.

An active role in safety management means that the CM is directly involved and engaged in overseeing and ensuring the safety of the project or operation. This includes actively monitoring, implementing and enforcing safety protocols, as well as taking quick action to address any safety concerns. The other options, such as observational, indirect, and passive, all suggest a more hands-off or distant approach to safety management, which may not be as effective in promoting and maintaining a safe working environment.