If t is eentinueus en the interval [a,b], then which of the following four statements are always true? Select all that are always true. is D A- Ix} d): is an antideriyatiye uf x]. a h |:I B. Ix} d): is the area bounded by the graph of t, the xaxis, and the lines 3: = a and x: i}. is D C. Ix} d): may not exist. a is D D- Ix} d): is a number