TCP协议使用三次握手建立连接,设双方发送初始序号分别为X、Y,甲方发送帧为SYN = 1,Seq = X的报文给乙方,则乙方接受报文后,发送( )给甲方,甲方发送一个确认报文给乙方后便建立连接。
(A)SYN = 0,Seq = Y,AN = X + 1
(B)SYN = 0,Seq = X + 1,AN = X + 1
(C)SYN = 1,Seq = Y,AN = X + 1
(D)SYN = 1,Seq = X + 1,AN = Y
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