Question: What protocol does NG-RAN use for establishing the first connection, and what is the reference for this protocol?
Option 1: SCTP (IETF RFC 4960)
Option 2: TCP (IETF RFC 793)
Option 3: UDP (IETF RFC 768)
Option 4: HTTP (IETF RFC 7230)
Explanation: NG-RAN uses the Stream Control Transmission Protocol (SCTP) for establishing the first connection, which is specified in IETF RFC 4960. This protocol is used for reliable data transfer between IP endpoints.