Which of the Following Is True About Source Acknowledgments

Which of the following is true about source acknowledgments?

A) Source acknowledgments must always specify the who, what, where, when, and why of the five Ws.
B) Source acknowledgments are similar to talking headings which give a reader the main message of the visual.
C) Source acknowledgments, by convention, are typed in title case.
D) Source acknowledgments are keyed to the part that they explain by means of a superscript number or symbol.
E) Source acknowledgments are the bottom-most components of a visual.