After Manually Editing a Regular Expression (Regex), Which of the Following

Multiple Choice

After manually editing a regular expression (regex) , which of the following statements is true?

A) Changes made manually can be reverted in the Field Extractor (FX) UI.
B) It is no longer possible to edit the field extraction in the Field Extractor (FX) UI.
C) It is not possible to manually edit a regular expression (regex) that was created using the Field Extractor (FX) UI.
D) The Field Extractor (FX) UI keeps its own version of the field extraction in addition to the one that was manually edited.