Rectangle $DEFA$ below is a $3 \times 4$ rectangle with $DC = CB = BA = 1$. T h e a r e a $$. The area of the "bat wings" (shaded area) is ? A. 2
B. $2\frac{1}{2}$
C. 3
D. $3\frac{1}{2}$
E. 4

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