Which of the following identifiers is invalid

Solution (By Examveda Team)

Identifiers are names given to variables, functions, classes, etc., in programming languages.

Valid identifiers can include letters (a-z, A-Z), digits (0-9), and underscores (_), but they cannot start with a digit.

Option A: printname - This is a valid identifier as it follows the rules.

Option B: enum - This is an invalid identifier because enum is a reserved keyword in many programming languages (e.g., C, C++, Java, Python). Keywords cannot be used as identifiers.

Option C: writername - This is a valid identifier as it follows the rules.

Option D: papername - This is a valid identifier as it follows the rules.

Therefore, the correct answer is Option B: enum.