Which of the following is correct syntax for a button click event handler, foo?

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Question:Which of the following is correct syntax for a button click event handler, foo?

1.<button onclick=this.foo()>

2.<button onclick=this.foo>

3.<button onClick={this.foo()}>

4.<button onClick={foo}>

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  1. Which of the following is correct syntax for a button click event handler, foo?
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