Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (WIRED) -- Google's netbook-friendly Chrome OS takes direct aim at Microsoft, whose eight-year-old Windows XP leads the netbook market. But the odds are stacked against Google. Despite its buzz, the odds are stacked against Google's Chrome OS becoming a serious rival to Windows. In competing with Windows, Google Chrome OS will have to deal with many of the same challenges Linux has: compatibility, usability, and unfamiliarity. The record isn't good: In the past year, Linux-based netbooks have rapidly lost market share to Microsoft, as people find that Linux doesn't work as expected, may not support the applications or peripherals they're used to using, and is just plain different.The odds are stacked against Google's new operating system as a rival to WindowsChrome OS must face the same challenges as Linux: compatibility and unfamiliarityA big stumbling block for Google will be whether its system supports iTunesGoogle must work with PC makers to ensure netbooks are pre-loaded with Chrome 
 Question:Here's what Google needs to figure out to make _ a success.

Chrome OS