TCP allows for reliabilty in connections which would be required for terminal emulation. The following answers are incorrect: UDP. Is incorrect because with User Datagram Protocol (UDP) you don’t have a reliable transmission, datagrams could arrive out of sequence. SNMP. Is incorrect because it is a network management protocol, Simple Network Management Protocol (SNMP).
IGP. Is incorrect because Interior Gateway Protocol (IGP) is used interally on a network.