When used as a return type, which Rust type plays a similar role to Python's None, JavaScript's null, or the void type in C/C++?

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Question:When used as a return type, which Rust type plays a similar role to Python's None, JavaScript's null, or the void type in C/C++?

1.!

2.None

3.Null

4. ()

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  1. When used as a return type, which Rust type plays a similar role to Python's None, JavaScript's null, or the void type in C/C++?
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