What happens if part of an FTP message is not delivered to the destination?

Question:
What happens if part of an FTP message is not delivered to the destination?

• The message is lost because FTP does not use a reliable delivery method.
• The FTP source host sends a query to the destination host.
• The part of the FTP message that was lost is re-sent.
• The entire FTP message is re-sent.

Explanation: Because FTP uses TCP as its transport layer protocol, sequence and acknowledgment numbers will identify the missing segments, which will be re-sent to complete the message.

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