In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. A(66)is basically an end point of a communication link between two applications. Sockets that extend over a network connect two or more applications running on separate computers at tached to the network. A socket(67)two addresses:(68). Sockets provide a(69)communication channel between one or more systems. There are stream and datagram sockets separately using TCP and(70).