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3) send 404 header - redirect to correct page (or is that bad for Googlebot?)
Have you just migrated your site from Wordpress to some other system?
If you send a 404 header, how do you propose to send a 301 header as well?
header ("HTTP/1.1 404 Not Found");
header ("Location: http://www.mysite.com/correctpage.html");
If you combine it with a 404 header, it is unknown what will actually be sent (I assume only a 302 header).
If you somehow managed to send both 404 and 302, there is no knowing what Google would do and which one they would ignore.