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

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

Answer : C

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1) All keywords in C are in

LowerCase letters

2) 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

3) Variable name resolving (number of significant characters for uniqueness of variable) depends on

Compiler and linker implementations

Assemblers and loaders implementations

C language

None

4) A constant cannot be used except:

For assigning initial value to a variable

With ++ operator

As a formal argument

On LHS of an assignment operator

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

int _a3;

int a_3;

int 3_a;

int _3a