$\backslash$Large$\{\backslash$text$\{$Which one of the following qualify as rules for naming variables? $\}\}$

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a

may consist of letters $($upper or lower$)$; digits; and the underscore $(\_)$ characters.

b

must begin with a letter or an underscore $(\_)$

c

must not be longer than $31$ characters. Although there is no rule on the length of a variable name some compilers may complain if the variable name is more than $31$ characters.

d

may not be a reserved word of C $($e$.$g$.$ "include" is a reserved word$).$ Please