What is the relationship between Goldman Sachs and Investment bank 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.

Investment bank Goldman Sachs have maintained their ratings on all of Australia's major banks but have warned of stiff demographic headwinds for the sector as regulatory changes kick in and baby boomers pay down debt.

Answer: product_or_material_produced