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Declarations and Initializations - Programming

Q1:

Which of the following special symbol allowed in a variable name?

A * (asterisk)

B | (pipeline)

C - (hyphen)

D _ (underscore)

ANS:D - _ (underscore)

Variable names in C are made up of letters (upper and lower case) and digits. The underscore character ("_") is also permitted. Names must not begin with a digit. Examples of valid (but not very descriptive) C variable names:
=> foo
=> Bar
=> BAZ
=> foo_bar
=> _foo42
=> _
=> QuUx