page 492 security guide states the below.
A + B are correct.
An antivirus profile in full scan mode buffers up to your specified file size limit. The default is 10 MB. That is
large enough for most files, except video files. If your FortiGate model has more RAM, you may be able to
increase this threshold.
Without a limit, very large files could exhaust the scan memory. So, this threshold balances risk and
performance. Is this tradeoff unique to FortiGate, or to a specific model? No. Regardless of vendor or model,
you must make a choice. This is because of the difference between scans in theory, that have no limits, and
scans on real-world devices, that have finite RAM. In order to detect 100% of malware regardless of file size,
a firewall would need infinitely large RAM—something that no device has in the real world.
Most viruses are very small. This table shows a typical tradeoff. You can see that with the default 10 MB
threshold, only 0.01% of viruses pass through.
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