What critical strategic error is widely considered the biggest factor in Borders Books' eventual bankruptcy and closure?

The retail landscape is littered with once-mighty companies that failed to adapt. Borders Books was once a dominant force in bookselling before its dramatic 2011 bankruptcy and liquidation. This poll tests your knowledge about one of the most significant retail failures in recent history - a cautionary tale of missed opportunities and strategic missteps in the face of digital disruption.

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Outsourcing their online sales to Amazon in 2001, missing the e-commerce revolution
Expanding too aggressively into international markets, particularly in Asia
Focusing exclusively on academic textbooks while ignoring general interest categories
Investing heavily in music CD sales just as digital streaming was becoming dominant