Which step should be taken to troubleshoot this issue?

An organization has two different Isilon clusters:

– Six-node cluster in London, England

– Eight-node cluster in Paris, France

They are using SynclQ to replicate between the clusters. Each site has access zones configured and SmartConnect Advanced is licensed.

The organization is actively engaged in a failover from Paris to London. During testing, they realize that users from the Sales department in Paris are receiving authentication errors from the London cluster.

Which step should be taken to troubleshoot this issue?
A . Verify that the Sales access zones for Paris are configured on the London cluster
B . Verify that the Sales access zones for London are configured on the Paris cluster
C . Verify that the SmartConnect zone for Sales in Paris is set to the system access zone
D . Verify that the London cluster retained the Paris user list