Utilize the input text as a context reference, choose the right relationship between Optiver and financial services 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.

Mecca Brands came second, with financial services firm Optiver taking third place in the survey of Australian workers, conducted by BRW and Great Place to Work Australia .

Answer: industry