Answer & Solution
Answer: Option C
Solution:
BaseFieldType provides three events that you can latch code onto:
1.
onBeforeSave() : Called right before a field is saved.
2.
onAfterSave() : Called right after a field is saved, and
$this->model->id is set.
3.
onAfterElementSave() : Called right after an element is saved, and
$this->element->id is set.