In the LAN-WAN convergence scenario, which is the wrong description of the RR deployment design principles?

In the LAN-WAN convergence scenario, which is the wrong description of the RR deployment design principles?
A . RR must be configured redundantly, and there must be at least two RR devices in the existing network. Avoid having only one RR device in the entire network. If the RR device fails, the services of the entire network will be interrupted;
B . Try to choose an independent RR. In an independent RR scenario, a single device can be deployed;
C . Use the RR model recommended in the specification list;
D . Edge should be dual uplinked to two RR devices to achieve egress backup;

Answer: B