Which of the Following Is True of Footnotes

Which of the following is true of footnotes?

A) Footnotes are placed above the captions if the visuals contain captions.
B) Footnotes are detailed explanations placed below the visual by means of a subscript number or symbol.
C) Footnotes, by convention, appear above the tables or visuals that they refer to.
D) Footnotes are keyed to the parts that they explain by means of a superscript number or symbol.
E) Footnotes are the top-most components of a visual.