Utilize the input text as a context reference, choose the right relationship between Ken Lay and chief commissioner of Victoria Police 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.

The list of prominent Australians who have been called in as troubleshooters includes retired judges Ian Callinan, Geoffrey Davies and Julie Dodds-Streeton at CBA; former Victorian premier Jeff Kennett at Coles; former chief commissioner of Victoria Police Ken Lay at Australia Post; and former prudential regulator Jeff Carmichael at CBA.

Answer: position_held