Answer :
The correct option is the first one .
We know that we filled the dot on the number line if it is given that
[tex]n\ge0\text{ or n}\leq0[/tex]where filling of dot represents that n can be equal to 0.
Since n>0 so third and fourthn options are not correct.
And the second option represents n<0. Hence second option is also not correct.
So the right answer is the first one.