正解:A
The status "QM_IDLE" indicates that the ISAKMP Security Association (SA) is in a Quick Mode idle state, meaning it's authenticated and can be used for Quick Mode. In this state, the SA is established but idle, waiting to be activated to protect data flows between peers.
References: The Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course provides a deep dive into Service Provider technologies including core architecture, services, networking, automation, quality of services, security, and network assurance.