A socket address is the combination of an IP address and a port number, much like one end of a telephone connection is the combination of a phone numberand a particular extension. Sockets need not have an address (for example for only sending data), but if a program binds a socket to an address, the socket can be used to receive data sent to that address.
Hence,Option(B)Socket address.
Reference:- https://en.wikipedia.org/wiki/Network_socket