1. Single-threaded
  2. Single-threaded
  3. Both Single-threaded and Multi-threaded
  4. None of the mentioned
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1 Answers

Answer: Option 1

One of the fundamental features of client-side JavaScript is that it is single-threaded: a browser will never run two event handlers at the same time, and it will never trigger a timer while an event handler is running, for example.

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