What is the relationship between Openreach and BT Group 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.

BT Group (LSE: BT-A.L - news ) has played a vital role by investing £10.5bn of capital in to Openreach over the past 10 years.”

Answer: parent_organization