Analyze the relationship between 'launched' and 'music streaming' within the context of the input sentence.
Options: operator, manufacturer, distribution format, currency

In addition, Apple offers financing schemes where buyers of its latest iPhone 6 can pay in monthly instalments, and has launched Apple Music, a cloud-based music streaming service, for just 120 rupees ($1.88) a month in India - a fifth of the price in the United States.
distribution format