ITC daily chart: After completion of Normal or Trending Impulse, the price falls. We can see clearly that the first leg of this fall looks like an impulse (shown by red 1-2-3-4-5), which is wave A of Zig-zag. Then price retraced to 38.2% forming wave B. Currently, wave C is developing in ITC. The minimum fall for this is 61.8% extension, which is near the 459 level. Remember that this is a minimum fall for any Zig-zag pattern. If the price breaks 459 and starts trading below it, the target of 100%, which is near 438.85, will be achieved. (This also fulfills the Rule of Equality).
This analysis is based on Elliott Wave theory and Fibonacci.