निम्नलिखित में से कौन एक valid identifier नहीं है? , Which one of the following is not a valid identifier?

A. _infomax

B. 3infomax

C. infomax_ica

D. infomax123

Correct Answer :

B. 3infomax

Explanation

The first character of an identifier can only contain alphabet(a-z , A-Z) or underscore ( _ ).