What is the relationship between Mandiant and FireEye 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.

You know it FireEye comes to mind having bought Mandiant and we just saw Palo Alto buy a company with a very clearly articulated strategy around leveraging breach response into product sales.

Answer: parent_organization