What is the relationship between HBO Max and WarnerMedia 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.

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: operator