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

With this goal in mind, Vodafone is using some of the cash from the Verizon Wireless sale to upgrade its network.

Answer: parent_organization