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.
Utilize the input text as a context reference, choose the right relationship between 'Sony' and 'software' from the options.
Options: headquarters location, product/material produced, chief executive officer, stock exchange