Acme Web Hosting is replacing one of their firewalls with a FortiGate. It must be able to apply port forwarding to their back-end web servers while blocking virus uploads and TCP SYN floods from attackers. Which operation mode is the best choice for these requirements?
A. NAT/route
B. NAT mode with an interface in one-arm sniffer mode
C. Transparent mode
D. No appropriate operation mode exists