Geometry

Question Analysis：
This question involves using coordinates to classify a quadrilateral.

Key Concept Explanation:
A rectangle has:
Opposite sides parallel and congruent
All angles 90°

Step-by-Step Solution：
Slope of AB: (0 - 0)/(4 - 0) = 0
Slope of BC: (3 - 0)/(4 - 4) = undefined
Slope of CD: (3 - 3)/(0 - 4) = 0
Slope of DA: (0 - 3)/(0 - 0) = undefined
Opposite sides have equal slopes (parallel), and adjacent sides are perpendicular (horizontal and vertical).
Distance formula:  

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