Which is the right way of declaring a variable in PHP? i) $3hello ii) $_hello iii) $this iv) $This

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Question: Which is the right way of declaring a variable in PHP? i) $3hello ii) $_hello iii) $this iv) $This

1.Only ii)

2.Only iii)

3.ii), iii) and iv)

4. ii) and iv)

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  1. Which is the right way of declaring a variable in PHP? i) $3hello ii) $_hello iii) $this iv) $This
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