Which innovative marketing strategy helped Celestron's NexStar series become one of the best-selling telescope lines for beginners between 2011-2015?

The astronomy equipment market is highly competitive, with brands constantly innovating to capture the imagination of both amateur stargazers and professional astronomers. One company made a particularly brilliant marketing move in the early 2010s that dramatically increased telescope sales to beginners. This question tests your knowledge of product marketing strategies that transformed the astronomy retail landscape.

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Their 'One Star at a Time' campaign that donated one telescope to schools for every ten sold at retail
The integration of smartphone connectivity and an app that guided users to celestial objects, marketed as 'Your Personal Astronomy Guide'
Their revolutionary lifetime warranty program called 'Stargazer's Guarantee' that promised free repairs and maintenance
The celebrity endorsement campaign featuring famous astrophysicists in television commercials and social media content