Which of these is OKAY to use for a variable name?

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BlackTom AI · Accepted Answer

When choosing a name for a variable, the rules typically require that identifiers start with a letter or underscore and consist only of letters, digits, or underscores; spaces or special characters like hyphens are not allowed. 
Option 1: '2nd_employee' starts with a digit, which violates the typical identifier rule that forbids starting with numbers. This would be rejected by most programming languages.
Option 2: 'employee salary' contains a space, which is not permitted in identifiers. Identifiers must be single tokens without whitespace.
Option 3: 'employee_hire_date' uses only letters and underscores and does not start with a digit or include spaces or hyphens. This conforms to common variable-naming conventions across many languages, making it a valid identifier.
Option 4: 'date-of-birth' contains a hyphen, which is usually interpreted as a minus operator or invalid in an identifier, so it would not be allowed as a variable name.
In summary, the only name that adheres to standard variable-naming rules is 'employee_hire_date' because it uses permitted characters and formatting, avoiding spaces, hyphens, and initial digits.

29:623:321:62 DESIGN & CREATE WEB Final Exam

Which of these is OKAY to use for a variable name?

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