In the context of the input sentence, determine the relationship between 'SABMiller' and 'LONDON'.
Options: distributed by, publisher, headquarters location, parent organization

LONDON (Reuters) - Brewer Anheuser-Busch InBev (ABI.BR) may raise its takeover offer for SABMiller (SAB.L) ahead of Wednesday's bid deadline, a source close to the matter said on Sunday.
headquarters location