Which technological advancement was MOST crucial in enabling major streaming services like Netflix to shift from mail-order DVD rentals to streaming high-definition films and TV shows?

The film and television industry has undergone massive transformations in how content reaches consumers. Streaming platforms have revolutionized distribution models, but the technology powering these changes is often misunderstood. This trivia question explores a key technological advancement that has enabled the modern streaming era and changed how viewers consume entertainment content.

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Content Delivery Networks (CDNs) that distribute cached content from servers closer to end users
Quantum computing capabilities that process viewer recommendations
Blockchain technology for secure content licensing agreements
Virtual reality servers that compress traditional content for modern devices