Which option is related to a Web Worker?

 Posted by vishalneeraj-24503 on 9/1/2014 | Category: HTML 5 Interview questions | Views: 1170 | Points: 40
Select from following answers:
  1. A web worker is a JavaScript which runs in the background.
  2. It is independent of other scripts and does not affect the performance of the page.
  3. Web workers are usually used for CPU intensive tasks.
  4. It exists in external files.
  5. All Above

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