A student sets up a balance using a ruler and a pivot as shown in the diagram.

Which statement is correct?
There is a resultant moment anti-clockwise of 100 N cm100\text{ N cm}100 N cm.
There is a resultant moment clockwise of 100 N cm100\text{ N cm}100 N cm.
There is a resultant moment anti-clockwise of 300 N cm300\text{ N cm}300 N cm.
There is a resultant moment of 0 N cm0\text{ N cm}0 N cm.