What is the purpose of developing field editor buttons for Experience Editor?

[answerhappygod]

What is the purpose of developing field editor buttons for Experience Editor?

A. To allow Content Authors to edit image fields within Experience Editor.
B. To provide additional field-editing functionality for complex fields through a pop-up window.
C. To give Content Authors the ability to change the field type as they work on content.
D. To open the rich text editor for fields of the rich text type in Experience Editor.