$15\mathrm{.}5$ To register a source for an action event with a handler, use $\_\_\_\_\_\_\_\_\_\_.$

Group of answer choices

A$.$ source.addAction$($handler$)$

B$.$ source.setOnAction$($handler$)$

C$.$ source.addOnAction$($handler$)$

D$.$ source.setActionHandler$($handler$)$