Which of the following violations cannot be learned by Traffic Learning?

RFC violations indicate that a request fundamentally breaks the HTTP protocol standard - for example, a malformed request line or illegal header format. Because these violations are never valid by definition, Traffic Learning has no mechanism to suggest accepting them; the system is designed to learn legitimate application patterns, and RFC-violating requests fall entirely outside that scope.

File type length violations can be learned because Traffic Learning can observe that a legitimate file type regularly appears with a longer URL and suggest raising the allowed length limit.

Attack signature violations can be learned when Traffic Learning identifies a signature firing as a false positive on a specific parameter and suggests disabling that signature for the affected entity.

Meta character violations on a specific parameter can be learned because Traffic Learning can detect that a parameter legitimately contains special characters and suggest adding those characters to the parameter's allowed meta character set.