What is the relationship between stock market and Stock Exchange 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.

Banks reopened last Monday and Greece submitted a plan to the European Central Bank last week for an opinion before a decision was made by the Greek finance ministry which would allow the stock market to resume trading as early as Monday.The Athens Stock Exchange official said Greece needed more time to finalize the details which would allow the market to reopen based on ECB's opinion.

Answer: operator