On an Open-High-Low-Close Chart, the Price Channel Is

On an open-high-low-close chart, the price channel is:

A) bounded on the lower level by the opening price for each trading day.
B) a linear function with points set at the closing price of each trading day.
C) bounded by the daily opening and closing prices.
D) bounded by both an upper and a lower trend line.
E) a graph of the difference between a day's high and low price.