Which two issues could cause this error?

Scenario: An existing setup of session recording has stopped working. After investigating, a Citrix Engineer finds that the Session Recording Agent cannot connect to the Session Recording Server. The following error is displayed:

"The underlying connection was closed. Could not establish a trust relationship for the SSL/TLS secure channel. "

Which two issues could cause this error? (Choose two.)
A . The Session Recording server is down or unavailable to accept requests.
B . The sessions are started but a request for a record policy evaluation was NOT made.
C . The server hosting the Session Recording Agent does NOT have a CA certificate.
D . The Session Recording server is using a certificate signed by a CA that the server hosting the Session Recording Agent does NOT trust.

Answer: BC

Explanation:

Reference: https://docs.citrix.com/en-us/xenapp-and-xendesktop/7-15-ltsr/monitor/session-recording/ troubleshooting.html