Answer: Option 3Concept: TCP:The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite. It originated in the initial network implementation in which it complemented the Internet Protocol (IP). Therefore, the entire suite is commonly referred to as TCP/IP.Port NumberTCP HeaderIP addressIPv4 header (or IPv6 header)MAC addressData Link Layer TCP Header:Source Port: This is a 16-bit field that defines the port number of the application program in the host that is sending the segment.Destination Port: This is a 16-bit field that defines the port number of the application program in the host that is receiving the segment.Explanation:In networking Port is an endpoint of communication in an operating system, it is a logical construct that identifies a specific process or a type of network service such as Hypertext Transfer Protocol (HTTP) used in the World Wide Web has port number 80.