What is the relationship between Korn Ferry and professional services in the context of the input sentence. Choose an answer from: 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 executive search market, although incredibly strategically important to Korn Ferry and an advantage that other people professional services firms do not have, I think that executive search market is probably no more than $5 billion.
industry