Using FTP passive mode, after the client opens thecommand channel (port 21) to the FTP server and requests passive mode, what will be the next step? ()
A. The FTP server sends back an acknowledgment (ACK) to the client
B. The FTP server allocates a port touse for the data channel and transmit that port number to the client
C. The FTP server opens the data channel to the client using the port number indicated by the client
D. The FTP client opens the data channel to the FTP server on Port 20
E. The FTP client opens the datachannel to the FTP server on Port 21
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在下列名酒中,依次属于酱香型、浓香型、清香型的是()。
A. 五粮液、汾酒、茅台酒
B. 茅台酒、五粮液、汾酒
C. 老窖特曲、茅台酒、汾酒
D. 茅台酒、泸州老窖特曲、五粮液