Referring to the exhibit, what is causing the problem?

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Users at a remote office are unable to access an FTP server located at the remote corporate data center as expected. The remote FTP server is listening on the non-standard TCP port 2121.

Referring to the exhibit, what is causing the problem?
A . The FTP clients must be configured to listen on non-standard client ports for the FTP data channel negotiations to succeed.
B . Two custom FTP applications must be defined to allow bidirectional FTP communication through the SRX Series device.
C . The custom FTP application definition does not have the FTP ALG enabled.
D . A new security policy must be defined between the untrust and trust zones.

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Answer: D