In the WLAN R22 Spruce version, which of the following description about the dual-machine hot standby feature is incorrect?

In the WLAN R22 Spruce version, which of the following description about the dual-machine hot standby feature is incorrect?
A . HRP backup tunnel replaces the original V5 HSB backup tunnel; supports multiple HRP tunnels, HRP multi-tunnel redundancy and high reliability; supports configuration synchronization.
B . HRP supports detecting heartbeat vlanif down and fast switching to achieve second-level switching.
C . HRP independently completes the master and backup status negotiation, and the HRP protocol forwarding plane offloads high-priority protection to prevent the master and backup status from oscillating in overload conditions.
D . Tunnel-level security encryption supports AES256 tunnel encryption, and business data does not need to be encrypted by yourself.

Answer: A