HPE6-A77 practice

Q3 Single choice

A customer has a ClearPass cluster deployment with four servers, two servers at the data center and two servers at a large remote site connected over an SD-WAN solution.
The customer would like to implement OnGuard, Guest Self-Registration, and 802.1x authentication across their entire environment. During testing the customer is complaining that users connecting to an Instant Cluster Employee SSID at the

remote site, with the OnGuard Persistent Agent installed are randomly getting their health check missed.

What could be a possible cause of this behavior?

A
The OnGuard Clients are automatically mapped to the Policy Manager Zone based on their IP range but an ACL on the switch could be blocking access.
B
The traffic on the TCP port 6658 is congested due to the fact that this port is also used by the IPsec keep-alive packets of the SD-WAN solution.
C
The ClearPass Policy Manager zones have been defined but the local IP sub-nets have not been property mapped to the zones and the OnGuard Agent might connect to any of the servers in the cluster.
D
The Aruba-user-role received by the IAP is filtering the TCP port 6658 to the ClearPass servers and after 10 seconds the SSL fallback gets activated and randomly generates the issue.