What caused Radio Shack to fail?

What led to the downfall of Radio Shack, a once-prominent electronics retailer? Did the rise of online shopping and e-commerce platforms pose too great a threat to their brick-and-mortar business model? Were their product offerings no longer in line with consumer demands and preferences? Did mismanagement and strategic blunders contribute to their decline? How did they fail to adapt to the ever-changing landscape of the retail industry?