Which of the following code correctly registers a handler with a button btOK?
a. btOK.setOnAction(e -> System.out.println("Handle the event"));
b. btOK.setOnAction((e) -> System.out.println("Handle the event"););
c. btOK.setOnAction((ActionEvent e) -> System.out.println("Handle the event"));
d. btOK.setOnAction(e -> {System.out.println("Handle the event");});
abcd
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