Which one of the following is the right way to call a class constant, given that the class is mathFunction?

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Question:Which one of the following is the right way to call a class constant, given that the class is mathFunction?

1.echo PI;

2. echo mathFunction->PI;

3.echo mathFunction::PI;

4.echo mathFunction=PI;

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  1. Which one of the following is the right way to call a class constant, given that the class is mathFunction?
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