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Which of the following should be one FIRST to resolve t…

A customer is attempting to download a file from a remote FTP server, but receives an error that a connection cannot be opened. Which of the following should be
one FIRST to resolve the problem?

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A.
Ensure that port 20 is open

B.
Ensure that port 161 is open

C.
Flush the DNS cache on the local workstation

D.
Validate the security certificate from the host

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