A) The server name indication (SNI) extension in the client hello message. This is correct. This is a piece of information that FortiGate uses to identify the hostname of the SSL server when SSL certificate inspection is enabled. The SNI extension is a feature of the TLS protocol that allows a client to indicate the hostname of the server it wants to connect to during the TLS handshake. This helps the server to present the appropriate certificate for the requested hostname, especially when the server hosts multiple domains on the same IP address1. FortiGate can use the SNI extension in the client hello message to identify the hostname of the SSL server and verify it against the server certificate2.
B) The subject alternative name (SAN) field in the server certificate. This is correct. This is a piece of information that FortiGate uses to identify the hostname of the SSL server when SSL certificate inspection is enabled. The SAN field is an extension of the X.509 certificate standard that allows a certificate to specify multiple hostnames or IP addresses that are valid for the certificate. This helps the certificate to support multiple domains or subdomains on the same server, or multiple servers with different IP addresses3. FortiGate can use the SAN field in the server certificate to identify the hostname of the SSL server and verify it against the client request2.
E) The subject field in the server certificate. This is correct. This is a piece of information that FortiGate uses to identify the hostname of the SSL server when SSL certificate inspection is enabled. The subject field is a part of the X.509 certificate standard that contains information about the identity of the entity that owns the certificate, such as common name, organization, country, and so on. The common name usually specifies the hostname or domain name of the server that owns the certificate4. FortiGate can use the subject field in the server certificate to identify the hostname of the SSL server and verify it against the client request2.