Which is valid C expression?

Which is valid C expression?

int my_num = 100,000;

int my_num = 100000;

int my num = 1000;

int $my_num = 10000;

Answer : B

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1) 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

2) The declaration "unsigned u" indicates:

u is an unsigned character

u is an unsigned integer

u is a character

None of the above

3) 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

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

Compiler and linker implementations

Assemblers and loaders implementations

C language

None

5) In case of ordinary int variables:

The leftmost bit is reserved for sign

The rightmost bit is reserved for sign

No bit is reserved for sign

None of the above