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: Google has unveiled a tiny HDMI dongle that can turn any TV into a fully fledged computer. Called the Chromebit, it uses Google's Chrome OS. It contains a fully featured PC which uses the  TV as its display, and wirelessly connects to a keyboard and mouse using bluetooth. Scroll down for video The new Chromebit will go on sale later this year from laptop maker Asus This chromebit has a HDMI port at one end which swivels so it can easily be plugged in. It also contains: Rockchip 3288 SoC processor 2GB of RAM 16GB of eMMC memory,Computer contains a HDMI port allowing it to be plugged straight into a TVRuns Google's ChromeOS softwareFirm also revealed two new laptops costing just $149 
 Question:Various PC manufacturers have been working with Google to design lightweight laptops running on the _ operating system since 2011.

Chrome OS.