What is causing the issue?

A user is trying to connect to a wireless network that is configured for WPA2-Enterprise security using a corporate laptop. The CA certificate for the authentication server has been installed on the Trusted Root Certification Authorities store on the laptop. The user has been prompted to enter the credentials multiple times, but the authentication has not succeeded.

What is causing the issue?
A . There is an IEEE invalid 802.1X authentication policy on the authentication server.
B . The user Active Directory account is locked out after several failed attempts.
C . There is an invalid 802.1X authentication policy on the authenticator.
D . The laptop has not received a valid IP address from the wireless controller.

Answer: A

Explanation:

https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Security/TrustSec_199/Dot1X_Deployment/Dot1x_Dep_Guide.html