What is the relationship between 'Ken Lay' and 'chief commissioner of Victoria Police' in the context of the input sentence.
Options: distribution format, currency, industry, position held

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.
position held