Which astronomy retail innovation, introduced in 2011, revolutionized telescope access through a subscription model that allowed users to 'trade up' to more advanced equipment as their skills improved?

The astronomy industry has seen some innovative retail and marketing strategies over the years. From telescope subscription services to observatory memberships and unique branding approaches, companies in the astronomy sector have found creative ways to bring the cosmos to consumers. This trivia question focuses on a significant retail innovation milestone in astronomy product history that changed how amateur astronomers access equipment.

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Celestron's 'Stellar Access Program'
Orion's 'Telescope Library'
Astronomers Without Borders' 'Telescope for All'
Slooh's 'Telescopes Live' subscription service