Which indicator in a TLS handshake suggests HTTP/2 negotiation via ALPN?

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Multiple Choice

Which indicator in a TLS handshake suggests HTTP/2 negotiation via ALPN?

Explanation:
ALPN (Application-Layer Protocol Negotiation) is used during the TLS handshake to agree on which application protocol to use. The client lists supported protocols in the ALPN extension, including "h2" for HTTP/2. If the server selects "h2", that indicates HTTP/2 negotiation via ALPN is taking place. Other options don’t signal protocol choice: the TLS version itself doesn’t prove ALPN usage, SNI is about the hostname, and certificate chain length relates to trust, not protocol negotiation. So the presence of ALPN advertising "h2" directly shows HTTP/2 negotiation via ALPN.

ALPN (Application-Layer Protocol Negotiation) is used during the TLS handshake to agree on which application protocol to use. The client lists supported protocols in the ALPN extension, including "h2" for HTTP/2. If the server selects "h2", that indicates HTTP/2 negotiation via ALPN is taking place. Other options don’t signal protocol choice: the TLS version itself doesn’t prove ALPN usage, SNI is about the hostname, and certificate chain length relates to trust, not protocol negotiation. So the presence of ALPN advertising "h2" directly shows HTTP/2 negotiation via ALPN.

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