Utilize the input text as a context reference, choose the right relationship between Vodafone and ONO 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.

Vodafone Espana and ONO said they would launch a month of negotiations with labour unions in September to reach "the best agreement possible for employees and both companies" on the layoffs.

Answer: subsidiary