Question at position 1 Which of the following is a valid variable name?firstVarfirst-varfirst var1stVarAll of the above are valid

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Question at position 1 Which of the following is a valid variable name?firstVarfirst-varfirst var1stVarAll of the above are valid

BlackTom AI · Accepted Answer

When evaluating which option is a valid variable name, several common programming naming rules come into play. 
Option 1: 'firstVar' — This follows typical rules: starts with a letter, contains only letters and digits, and uses camelCase. It is a valid identifier in most languages. 
Option 2: 'first-var' — The hyphen is generally interpreted as a minus operator, not allowed in variable names in standard identifiers, so this is invalid. 
Option 3: 'first var' — The space characters split identifiers in almost all languages, so this cannot be a single variable name. 
Option 4: '1stVar' — Starting with a digit is prohibited for standard variable names in most languages, which makes this invalid. 
Option 5: 'All of the above are valid' — Since several of the listed options are not valid identifiers, this statement is incorrect. 
In short, only Option 1 ('firstVar') satisfies the typical rules for valid variable names: begins with a letter, contains only letters and digits, and uses a conventional naming style. The other options violate one or more standard rules such as starting with a digit, including illegal characters, or including spaces.

Question at position 1 Which of the following is a valid variable name?firstVarfirst-varfirst var1stVarAll of the above are valid

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