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.
Take context from the input text and decide on the accurate relationship between 'Xbox' and 'Microsoft' from the options provided.
Options: chief executive officer, currency, owned by, employer