Two vertices of a rectangle are shown. If AC is a diagonal of the rectangle, and two other vertices of the rectangle, B and D, lie on the nodes of the grid, then how many rectangles have vertices A, B, C and D?

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Answer:
3
Step-by-step explanation:
There are 3 grid nodes suitable for vertex D that lie the same distance from the center of the rectangle as points A and C.
3 rectangles have vertices ABCD that lie on grid nodes.