Utilize the input text as a context reference, choose the right relationship between FireEye and Mandiant from the options. Options: 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.

We also created two separate brands, FireEye products and Mandiant Solutions, to better reflect our internal structure.

Answer: subsidiary