easy · Volume Price Analysis validation

In the context of Volume Price Analysis, how is the 'Spread' of a candlestick formally defined?

1. The absolute difference between the open and the close, represented as Spread = |C - O|.
2. The total range from the highest price to the lowest price (H - L).
3. The volume of the candle divided by the total range.
4. The length of the upper wick relative to the lower wick.

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