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) -- In an effort to streamline and simplify the maturity ratings of software in mobile app stores, CTIA, the international wireless industry association, yesterday proposed a ratings system that store owners could voluntarily adopt. Google and Apple basically told the CTIA to stuff it -- they're sticking with their own rating schemes. "We've put a lot of effort into Android Market's rating system, which now works well globally," Google spokesman Christopher Katsaros said in a statement. "While we support other systems, we think it's best for Android users and developers to stick with Android's existing ratings." Apple, too, has outlined its app review guidelines in extensive detail, but has not publicly commented on the CTIA app rating issue.CTIA proposes an app rating system to streamline maturity ratingsGoogle spokesman says Android will stick with the market's current rating systemIn its App Store, Apple provides an age rating ranging from 4+ to 17+ 
 Question:_'s App Store alone has more than half a million apps and Android is getting close to that number with at least 300,000.

Apple