Streaming market depth data: On what condition is quote data pushed?

prp edited July 2020 in Market data (WebSockets)
I want to execute trades based on (near) real-time analysis of market depth.
I want to know on which of the following conditions is quote data published on websocket?:
  1. When market depth data changes
  2. When an instrument is traded
  3. When an instrument is traded and LTP changes?
  4. Some other condition (please elaborate)

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