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What is the distance between the two points plotted?

A graph with the x-axis starting at negative 10, with tick marks every one unit up to 10. The y-axis starts at negative 10, with tick marks every one unit up to 10. A point is plotted at 3, 5 and at 3, negative 6.

a
1 unit

b
11 units

c
−11 units

d
−1 unit