Which one of the following is the right way of defining

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Which one of the following is the right way of defining a function in PHP?

1. function fuuctionName(parameters) { function body }
2. functionName(parameters) { function body }
3. data type functionName(parameters) { function body }
4. function { function body }
5. None of these

Correct Option: A

function fuuctionName(parameters) { function body }