Utilize the input text as a context reference, choose the right relationship between Red Hat and IBM 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.

Red Hat delivered strong results in the period with normalized revenue growth of 18%, driven by the synergistic effect of IBM and Red Hat.

Answer: parent_organization