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निम्न में से कौन सा वैध पहचानकर्ता नहीं है? , Which of the following is not a valid identifier?

निम्न में से कौन सा वैध पहचानकर्ता नहीं है?

Which of the following is not a valid identifier?
A. student

B. s12

C. 123

D. _123



Correct Answer :

C. 123



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