Which of the following cannot be a variable name in C?

Which of the following cannot be a variable name in C?

volatile

true

friend

export

Answer : A

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1) A declaration "short int" is used for variable

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

float PI = 3.14;

double PI = 3.14;

int PI = 3.14;

#define PI 3.14

3) Which of following is not a valid name for a C variable?

study2online

study2 online

study2online1

none

4) The declaration "unsigned u" indicates:

u is an unsigned character

u is an unsigned integer

u is a character

None of the above

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

int number;

float rate;

int variable_count;

int $main;