Question: For HTTP/2 request messages within the same Public Land Mobile Network (PLMN), how should the ":authority" HTTP/2 pseudo-header field be set for a target URI authority component designating an origin server?
Option 1: :authority = [userinfo "@"] uri-host : port, as per IETF RFC specifications.
Option 2: :authority = uri-host [:] port, excluding [userinfo "@"], where uri-host can be the FQDN or IP address of the target Network Function (NF) service.
Option 3: :authority = PLMN identifier : uri-host : port, mandating inclusion of the PLMN identifier for routing clarity.
Option 4: :authority = uri-path ; query, focusing on resource location rather than server identity.
Explanation: This is correct because the ":authority" field should be set with the uri-host (either the Fully Qualified Domain Name (FQDN) or the IP address of the target NF service) optionally followed by a port number, excluding any userinfo component, to correctly identify the origin server within the same PLMN.