What is the length of the line segment PQ on the coordinate grid?

A four-quadrant coordinate grid from negative 50 to positive 50 in increments of 10 is drawn. Point P is plotted on the ordered pair negative 20, 30. Point Q is plotted on the ordered pair 30, 30. The points are connected by a line.

10 units
20 units
30 units
50 units

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