A network technician is tasked with designing a firewall to improve security for an existing FTP server that is on the company network and is accessible from the internet. The security concern is that the FTP server is compromised it may be used as a platform to attack other company servers. Which of the following is the BEST way to mitigate this risk?
A. Add an outbound ACL to the firewall
B. Change the FTP server to a more secure SFTP
C. Use the implicit deny of the firewall
D. Move the server to the DMZ of the firewall