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?

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.

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Answer: A