TCS Company Programming Arrays

Which of the fplowing special symbp allowed in a variable name?
1.* (asterisk)
2.| (pipepne)
3.-(hyphen)
4._(underscore)

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TCS Other Question

What are the types of pnkages?
1.Internal and External
2.External, Internal and None
3.External and None
4.Internal
Is there any difference between following declarations?
A : extern int fun();
B : int fun();
1.Both are identical
2.No difference, except extern int fun(); is probably in another file
3.int fun(); is overrided with extern int fun();
4.None of these