{CodeRoyale}
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Multiple ChoiceIntermediate 30s

Socket.io

Choose the best answer for: Socket.io library
Options
  1. 1A thin WebSocket wrapper with no fallback transports at all
  2. 2Real-time engine with fallbacks (polling if WebSocket unavailable)
  3. 3A polling-only transport that never upgrades to a WebSocket
  4. 4A library that is unsuitable for real-time features entirely
fullstackintermediate

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