How does a Cisco ISE server determine whether a client supports EAP chaining?

How does a Cisco ISE server determine whether a client supports EAP chaining?
A . It sends an Mo5 challenge to the client and analyzes the response
B . It analyzes the options field in the TCP header of the first packet it receives from the client
C . It analyzes the EAPoL message the client sends during the initial handshake
D . It sends an identity-type TLV to the client and analyzes the response
E . It analyzes the
F . 509 certificate it receives from the client through the TLS tunnel

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Answer: D