Which of the following is not a valid C variable name?

Which of the following is not a valid C variable name?

int number;

float rate;

int variable_count;

int $main;

Answer : D

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1) The declaration "unsigned u" indicates:

u is an unsigned character

u is an unsigned integer

u is a character

None of the above

2) Which of the following is not a valid variable name declaration?

int __a3;

int __3a;

int __A3;

None of the mentioned

3) What is the problem in following variable declaration?
float 3Bedroom-Hall-Kitchen?;

The variable name begins with an integer

The special character ‘-‘

The special character ‘?’

All of the mentioned

4) Which of the following is not a valid variable name declaration?

int _a3;

int a_3;

int 3_a;

int _3a

5) All keywords in C are in

LowerCase letters

UpperCase letters

CamelCase letters

None