Which of the following is not a valid variable name in C? 1 a a 1 2 a b 123 a b

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Question
Which of the following is not a valid variable name in C?
Options
A. 1 a
B. a 1 2
C. a b 123
D. a b c 123

Correct Answer

1 a

Explanation

First character must be alphabet.

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