About the description of dual-active data center network architecture, which of the following is wrong?

About the description of dual-active data center network architecture, which of the following is wrong?
A . It is recommended that the distance between two data centers is no more than 100km away and have bare fiber resources.
B . The third-party arbitration site is connected to both Data Center A and Data Center B, with no distance restrictions.
C . In the core switch, the public network should be logically isolated from the private network and the arbitration network.
D . In the WDM device, the same WDM channel should be used to carry these types of networks (especially in large-scale networking scenarios).

Answer: D