Let $\frac{7}{2^{1/2} + 2^{1/4} + 1} = A + B \cdot 2^{1/4} + C \cdot 2^{1/2} + D \cdot 2^{3/4}$,where $A, B, C, D$ are rational numbers. Which of the following is true?
- A$A = 1$
- B$B = 3$
- C$C = 2$
- D$D = 1$
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