Utilize the input text as a context reference, choose the right relationship between open and Spotify 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.

Apple’s defenders say the iPhone’s App Store is open to most outside services —Google Maps, WhatsApp for messaging, Spotify for music, Dropbox for storage.

Answer: distributed_by