单选题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 clientB The FTP server allocates a port touse for the data channel and transmit that port number to the clientC The FTP server opens the data channel to the client using the port number indicated by the clientD The FTP client opens the data channel to the FTP server on Port 20E The FTP client opens the datachannel to the FTP server on Port 21
单选题
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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