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

* (asterisk)
| (pipeline)
- (hyphen)
_ (underscore)

Correct Answer: _ (underscore)

Explanation:

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

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