Utilize the input text as a context reference, choose the right relationship between Bob Dudley and Chief Executive Officer from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

LONDON, July 28 (Reuters) - BP is less likely to be acquired following its $18.7 billion settlement over the 2010 Macondo oil spill, Chief Executive Officer Bob Dudley said on Tuesday.

Answer: position_held