Take context from the input text and decide on the accurate relationship between 'SABMiller' and 'Anheuser-Busch InBev' from the options provided.
Options: developer, legal form, employer, parent organization

Mega-deals such as the $US245 billion ($348 billion) proposed tie-up between Anheuser-Busch InBev and SABMiller have captured investor attention.
parent organization