HTTP 404 means "Not Found" - the server cannot find the requested resource. Option C correctly states this meaning. Options A and B incorrectly attribute negative meanings to the numeric code itself, which is purely a technical status indicator.
HTTP status code 404 specifically means "Not Found" — the server understood the request but couldn't find any resource matching the requested URL. It's not a comment on the user's intelligence or a general error class; it strictly indicates that the requested location doesn't exist (or has been moved/removed) on that server.