Which line of code shows how to display a nullable string's length and shows 0 instead of null?

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Question:Which line of code shows how to display a nullable string's length and shows 0 instead of null?

1.Println(b!!.length ?: 0)

2.Println(b?.length ?: 0)

3.Println(b?.length ?? 0)

4.Println(b == null? 0: b.length)

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  1. Which line of code shows how to display a nullable string's length and shows 0 instead of null?
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