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.

"Our work to increase efficiency and reduce costs is embedding sustainable benefits throughout the Group and we continue with capital discipline and divestments," Chief Executive Officer Bob Dudley said in a statement.
position_held