Utilize the input text as a context reference, choose the right relationship between WarnerMedia and HBO 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.

A few months ago, we took the next step and moved Xandr to WarnerMedia so we could accelerate our progress in building software-based entertainment platforms supported by both subscription and advertising, like the AVOD version of HBO Max we plan to launch next year.

Answer: subsidiary