Geometry

Question Analysis:
This question checks for full classification of a square.
The main focus is combining properties of rectangles and rhombuses.

Key Concept Explanation:
A square is both a rhombus and a rectangle: all sides equal and all angles 90°.

Step-by-Step Solution:
A: Only guarantees rhombus
B: Could be a rhombus, not necessarily square
C: Could be rectangle
D: Meets both conditions → square
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