The 'set nat enable' command in a FortiGate firewall policy enables Source NAT (SNAT) for outgoing traffic, typically rewriting the source IP to the FortiGate's interface IP or an IP pool. It does not disable NAT (B), force a specific pool (C), or limit to incoming traffic (D). Exact extract: "The 'set nat enable' command in a firewall policy enables Source NAT, rewriting the source IP address of outgoing traffic to the egress interface IP or a configured NAT pool."

IPS efficiency is improved by: A) Compiling signatures into a decision tree to reduce comparison overhead; B) Using IPS sensors/filters to selectively apply signatures to relevant traffic, reducing unnecessary processing; D) Using a regular database instead of an extended one to lower memory usage. Option C's
"Turbo" and round-robin load balancing is not a standard Fortinet IPS feature. Option E is incorrect as C is not valid. Exact extract: "IPS efficiency is improved by compiling signatures into decision trees to minimize CPU usage... IPS sensors and filters allow selective signature application to reduce processing... Using the regular signature database instead of extended reduces memory footprint."

VMotion in VMware vSphere enables live migration of running virtual machines from one physical server to another with zero downtime, ensuring continuous operation. Fortinet's FortiGate-VM supports such environments. Options A, C, and D are incorrect as they do not describe VMotion; C refers to a different migration scenario, and D is unrelated to virtualization. Exact extract: "VMotion allows the live migration of a running virtual machine from one physical server to another with no downtime... This ensures workloads continue running during server maintenance or load balancing."