Gabriel is running a race. The function f(x) = a|x 20| represents his distance in miles from the water stop, where x is minutes. The graph of f includes the point (10, 1). Which of the following is true? A. The y-intercept represents the time Gabriel passes the water stop B. The vertex of the graph represents the time Gabriel passes the water stop. C. The x-intercept represents Gabriel's distance from the water stop at 0 minutes D. The function is decreasing over the interval 10 < x < 30