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If $a$ and $b$ are positive non-consecutive integers and $4^{a} \cdot 4^{b} = 1024$, which of the following equals $2^{a} + 2^{b}?$

(A) $\ \ 5$ (B) $\ \ 12$ (C) $\ \ 18$ (D) $\ \ 32$ (E) $\ \ 1024$

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