OHLC, body, and wick

You combine six 4-hour bars into one daily candle. Which prices do you take?

• The average of the six opens, highs, lows and closes
• The first bar's open, the highest high, the lowest low and the last bar's close
• The open, high, low and close of the middle bar

On a hollow-candle chart, what decides a candle's colour?

• Whether it closed above its own open
• Whether it closed above or below the previous candle's close
• The size of its body