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Based on the characteristic properties and hierarchy of quadrilaterals, which of the following statements is true?
A. A trapezoid cannot be classified as a quadrilateral, but can be classified as a parallelogram.
B. A rectangle can be classified as a square, but a square cannot be classified as a rectangle.
C. A rhombus can be classified as a rectangle, and can also be classified as a parallelogram.
D. A rhombus can be classified as a parallelogram, but cannot be classified as a square.
D. A rhombus can be classified as a parallelogram, but cannot be classified as a
square.