Variable names beginning with underscore is not encouraged. Why?

1.	Variable names beginning with underscore is not encouraged. Why?
A.	It is not standardized
B.	To avoid conflicts since assemblers and loaders use such names
C.	To avoid conflicts since library routines use such names
D.	To avoid conflicts with environment variables of an operating system
E.
Answer» D. To avoid conflicts with environment variables of an operating system

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Variable names beginning with underscore is not encouraged. Why?
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Variable names beginning with underscore is not encouraged. Why?

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