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

2) Which of the following is true for variable names in C?

They can contain alphanumeric characters as well as special characters

It is not an error to declare a variable to be one of the keywords(like goto, static)

Variable names cannot start with a digit

Variable can be of any length

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) A declaration "short int" is used for variable

Which have short duration in a program

Which have short names

Which may require less storage than normal integers

All of the above

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

int __a3;

int __3a;

int __A3;

None of the mentioned