Which of the Following Best Describes a Component Bar Chart

Which of the following best describes a component bar chart? $$\begin{array} { | l | l | } \hline \text { A. } & \text { A component bar chart represents all categories within a single bar. } \\\hline \text { B. } & \begin{array} { l } \text { The height of each component is proportional to the frequency of the category that it } \\\text { represents. }\end{array} \\\hline \text { C. } & \begin{array} { l } \text { Component bar charts may be used as a comparison of two or more breakdowns as an } \\\text { alternative to using two pie charts. }\end{array} \\\hline \text { D. } & \text { All of these choices are correct. } \\\hline\end{array}$$