After a session has been secured with MACsec, which two types of traffic can be sent and received unencrypted?

After a session has been secured with MACsec, which two types of traffic can be sent and received unencrypted?
A . EAPOL-Start
B . DHCP offer
C . Cisco Discovery Protocol
D . DHCP discover
E . EAPOL-Logoff

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Answer: A,C