In an IEEE 802.11-compliant WLAN, when is the 802.1X Controlled Port placed into the unblocked state?

In an IEEE 802.11-compliant WLAN, when is the 802.1X Controlled Port placed into the unblocked state?
A . After EAP authentication is successful
B . After Open System authentication
C . After the 4-Way Handshake
D . After any Group Handshake

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Answer: A