4. Which of the following is/are correct?
(A) A "scatterplot" is good for obtaining the potentialassociation between two numerical variables；
(B) Unlike "bar graph", a "histogram" has no naturalseparation between rectangles of adjacent classes；
(C) A "pie chart" is good for comparing the meansof a numerical variable between two independent groups；
(D) In a "Box-plot", the line drawn in thebox indicates the location of the mean；
(E) "100% stacked area chart" can be used to compare thechange in distribution of a categorical variable over a period of time.