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The correct answer is C.

OBJ-3.1: Web-based attacks would likely appear on port 80 (HTTP) or port 443 (HTTPS). An attack against Active Directory is likely to be observed on port 389 LDAP. An attack on an FTP server is likely to be observed on port 21 (FTP). An attack using the remote desktop protocol would be observed on port 3389 (RDP).

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