Venn Diagram - Number System: $\"venn$ $\"\"$

The numbers a and b are natural numbers.

The expression is $\"\"$ .

The above expression is not a natural number, since the counter example of the values of $\"\"$ is a natural numbers (N) but the expression value $\"\"$ is not a natural number.

The expression is $\"\"$ .

The above expression is a natural number, since the counter example of the values of $\"\"$ is a natural numbers (N) and the expression value $\"\"$ is a natural number.

The expression is $\"\"$ .

The above expression is not a natural number, since the counter example of the values of $\"\"$ is a natural numbers (N) but the expression value $\"\"$ is not a natural number. $\"\"$

The option B is correct answer.