Which marketing innovation did Celestron implement in 2016 that revolutionized how amateur astronomers purchase advanced telescopes?

The astronomy retail landscape has evolved dramatically with technological advancements. Telescopes have moved from simple optical devices to sophisticated computer-controlled instruments with advanced imaging capabilities. This trivia question explores how a major astronomy retailer revolutionized their marketing strategy to make high-end telescopes more accessible to amateur astronomers, significantly changing the consumer telescope market in the process.

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The 'StarSense Explorer' app that turns smartphones into telescope guidance systems
The 'Celestron Prime' subscription service offering telescope upgrades every 2 years
The 'AstroLease' program allowing customers to rent telescopes before purchasing
The 'Virtual Observatory' allowing customers to test telescopes remotely before buying