In the context of the input sentence, determine the relationship between 'Xbox 360' and 'Microsoft'.
Options: developer, position held, location of formation, chairperson

Microsoft ( MSFT.O ) added 1.2 percent to $20.76 after the software maker said it sold 28 million units worldwide of its Xbox 360 video game console through the end of 2008, extending the Xbox's lead over rival Sony Corp's ( 6758.T )( SNE.N ) PlayStation 3.
developer