Why do variable names beginning with the underscore is not encouraged?

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Question:Why do variable names beginning with the underscore is not encouraged?

1.It is not standardized

2. To avoid conflicts since assemblers and loaders use such names

3.To avoid conflicts since library routines use such names

4.To avoid conflicts with environment variables of an operating system

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  1. Why do variable names beginning with the underscore is not encouraged?
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