Which of the following is an accurate justification for the view that the internet is the most important disruptive innovation of the twentieth$$ century?

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Part $1$

A$.$

Switching costs have increased after the advent of the internet as a medium of trade.

B$.$

The internet reduced entry barriers for newcomers and empowered buyers with more information.

C$.$

The internet rejigged existing business processes and streamlined$$ them, giving many companies marginal advantages.

D$.$

Competition became oligopolistic with only a few companies investing in technology.