A JFrame contains a JButton named button1 that should execute an actionPerformed() method when clicked. Which statement

Question:

A JFrame contains a JButton named button1 that should execute an actionPerformed() method when clicked. Which statement is needed in the JFrame class?
a. addActionListener(this);
b. addActionListener(button1);
c. button1.addActionListener(this);
d. this.addActionListener(button1);

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