Solution

The correct answer is option 2.

Key Points

• Serial Line Internet Protocol (SLIP) is a Data Link layer simple protocol that works with TCP/IP for communication over serial ports and routers. They provide communications between machines that were previously configured for direct communication with each other. 
• Border Gateway Protocol (BGP) is a Network layer used to exchange routing information for the internet and is the protocol used between ISP which are different ASes.
• User Datagram Protocol (UDP) is a Transport Layer protocol. UDP is a part of the Internet Protocol suite, referred to as UDP/IP suite. Unlike TCP, it is an unreliable and connectionless protocol.
• SNMP is an application layer protocol that uses UDP port number 161/162.SNMP is used to monitor the network, detect network faults and sometimes even used to configure remote devices

∴ Hence the correct answer is A-III, B -IV, C -II, D -I.

Additional Information