Which network device is responsible for applying the digital signature to a certificate to ensure that the certificate is trusted and valid?

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An engineer is deploying EAP-TLS as the authentication mechanism for an 802.1X-enabled wireless network.

Which network device is responsible for applying the digital signature to a certificate to ensure that the certificate is trusted and valid?
A . supplicant
B . CA server
C . wireless controller
D . authentication server

Answer: B