You configured wired 802.1X with EAP‐TLS on Windows machines. The ISE authentication detail
report shows “EAP‐TLS failed SSL/TLS handshake because of an unknown CA in the client certificates
chain.” What is the most likely cause of this error?

A.
The ISE certificate store is missing a CA certificate.

B.
The Wireless LAN Controller is missing a CA certificate.

C.
The switch is missing a CA certificate.

D.
The Windows Active Directory server is missing a CA certificate.