问题详情

A socket 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(61)computers attached to the network. A socket(62)two addresses:(63). Sockets provide a(64)communication channel between one or more systems.There are(65)sockets separately using TCP and UDP.
A．unique
B．separate
C．same
D．dependent请帮忙给出正确答案和分析，谢谢！